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Pecora
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Pecora
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Pecora
Temporal range: 45–0 Ma Eocene - recent
Scientific classification Edit this classification
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Artiodactyla
Suborder: Ruminantia
Infraorder: Pecora
Flower, 1883[1]
Subgroups

Pecora is an infraorder of even-toed hoofed mammals with ruminant digestion. Most members of Pecora have cranial appendages projecting from their frontal bones; only two extant genera lack them, Hydropotes and Moschus.[2] The name "Pecora" comes from the Latin word pecus, which means "cattle".[3] Although most pecorans have cranial appendages, only some of these are properly called "horns", and many scientists agree that these appendages did not arise from a common ancestor, but instead evolved independently on at least two occasions.[2][3][4][5] Likewise, while Pecora as a group is supported by both molecular and morphological studies, morphological support for interrelationships between pecoran families is disputed.[2]

Evolutionary history

[edit]

The first fossil ruminants appeared in the Early Eocene and were small, likely omnivorous, forest-dwellers.[6] Molecular dating studies estimate that Ruminantia split into the two sister clades Pecora and Tragulina around 45 million years ago, during the Eocene.[2] However, it was not until 15 million years later, at around 30 million years ago during the Oligocene, that the evolutionary radiation of Pecora began and the five families appeared (Bovidae, Cervidae, Moschidae, Giraffidae, and Antilocapridae).[2]

The appearance of many Pecoran fossils during the Miocene suggests that its rapid diversification may correspond to the climate change events of that epoch,[6][7] as this time period was marked by much of Earth's forest habitats being replaced by grasslands due to widespread cooling and drying.[2]

It is likely that the antelopes, giraffids, and pronghorns evolved in an open environment while the cervids, including the caribou, evolved in a woodland habitat.[8] The type of gallop in Pecorian species is shown to be closely related to their environment and anatomy, where light Pecorian species use both flexed and extended suspensions in their fast gallops.[8] The white-tail and mule-deer have been observed to primarily use the extended suspension, since in this phase of their gallop they leap over bushes and logs that are present in their brush environment.[8] However, heavy Pecorian species do not use extended suspensions as most have backs that slope downward with shorter hind legs.[8]

Taxonomy and classification

[edit]

Pecora is an infraorder within the larger suborder Ruminantia, and is the sister clade to the infraorder Tragulina (of which Tragulidae is the only surviving family).

Pecora's placement within Artiodactyla can be represented in the following cladogram:[9][10][11][12][13]

Artiodactyla

Tylopoda (camels)

Artiofabula

Suina (pigs)

Cetruminantia
Ruminantia (ruminants)

Tragulidae (mouse deer)

Pecora (horn bearers)

Cetancodonta/Whippomorpha

Hippopotamidae (hippopotamuses)

Cetacea (whales)

Current attempts to determine the relationships among pecoran families (as well as all artiodactyls) rely on molecular studies, as little consensus exists in morphological studies.[2] Different families within Pecora are recognized as valid by different groups of scientists.[6]and sources therein, pp. 4–5

Until the beginning of the 21st century it was understood that the family Moschidae (musk deer) was sister to Cervidae. However, a 2003 phylogenetic study by Alexandre Hassanin (of National Museum of Natural History, France) and colleagues, based on mitochondrial and nuclear analyses, revealed that Moschidae and Bovidae form a clade sister to Cervidae. According to the study, Cervidae diverged from the Bovidae-Moschidae clade 27 to 28 million years ago.[14] The following cladogram is based on the 2003 study.[14]

Ruminantia

Infraorder Pecora ("horned ruminants", "higher ruminants")

Anatomy

[edit]

Pecorans share characteristics with other artiodactyls, including a four-chambered stomach, and a paraxonic foot, meaning that it supports weight on the third and fourth digits. Several characteristics distinguish Pecora from its sister taxon, Tragulina: an astragalus with parallel sides, a loss of the trapezium, and differences in parts of the skull such as the petrosal bone.[4]

The distinguishing features of most pecoran families are cranial appendages. Most modern pecorans (with the exception of the Moschidae) have one of four types of cranial appendages: horns, antlers, ossicones, or pronghorns.[6]

  • True horns have a bone core that is covered in a permanent sheath of keratin. They are indicative of Bovidae. Horns develop in the periosteum over the frontal bone, and can be curved or straight.[4] Surface features on the keratin sheath (e.g., ridges or twists) are thought to be caused by differential rates of growth around the bone core.[4]
  • Antlers are bony structures that are shed and replaced each year in members of the family Cervidae. They grow from a permanent outgrowth of the frontal bone called the pedicle.[4] Antlers can be branched, as in the white-tailed deer (Odocoileus virginianus), or palmate, as in the moose (Alces alces).
  • Ossicones are permanent bone structures that fuse to the frontal or parietal bones during the lifetime of an animal.[4] They are found only in the Giraffidae and closely related extinct clades,[4] represented in modern animals by the giraffe (Giraffa camelopardalis) and the okapi (Okapia johnstoni).
  • Pronghorns are similar to horns in that they have keratinous sheaths covering permanent bone cores; however, these sheaths are deciduous and can be shed like antlers.[4] Very little is known about the development of pronghorns, but they are generally presumed to have evolved independently.[4] The only extant animal with pronghorns is the pronghorn antelope (Antilocapra americana).

References

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Pecora

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Pecora is an infraorder of even-toed ungulate mammals (order Artiodactyla) within the suborder Ruminantia, encompassing the majority of living ruminants except for the primitive chevrotains (family Tragulidae). It includes five extant families: (pronghorns), (cattle, sheep, goats, and antelopes), Cervidae (deer), (four giraffe species and the ), and (musk deer). Pecorans are characterized by a specialized four-chambered that facilitates microbial of fibrous material, enabling efficient through rumination (chewing the ). Most species possess bony cranial appendages—such as true horns (permanent, keratin-covered cores in ), antlers (deciduous, branched structures in Cervidae), pronghorns (branched and shed annually in ), or ossicones (skin-covered projections in )—which emerge from the frontal bones and serve functions in , defense, and . Exceptions occur in the (Moschus spp.) and the Chinese water deer (Hydropotes inermis), which lack these structures. Dentally, they typically follow the I 0/4, C 0/1, P 3/2–3, M 3/3 (32–34 teeth), with no upper incisors and a gap () for food manipulation. The evolutionary origins of Pecora trace back to in the late Eocene to early , over 37 million years ago, with significant diversification during the epoch around 23–5 million years ago, driven by climatic changes and expansion. records indicate an initial radiation in and , followed by migrations to and the , giving rise to stem groups like the palaeomerycids and climacoceratids before the emergence of modern families. Today, Pecora exhibit global distribution across diverse s from tundras to savannas, with approximately 200–210 species as of 2025; the alone accounts for over 140 species in more than 50 genera, including economically vital domesticated forms like cows (Bos taurus) and sheep (Ovis aries). Their ecological roles range from herbivores shaping vegetation dynamics to in food webs, while many face threats from loss and overhunting.

Evolutionary history

Origins and divergence

The suborder Ruminantia emerged during the Eocene epoch, with molecular estimates and fossil evidence indicating an origin around 50 million years ago in , where early forms adapted to forested environments. The oldest known ruminant fossils, such as Archaeomeryx from the middle Eocene of , date to approximately 44 million years ago and represent primitive, small-bodied with basic selenodont . These early ruminants laid the foundation for the clade's subsequent radiation, characterized by the development of as a key digestive innovation. Pecora, comprising the advanced s including bovids, cervids, and giraffids, diverged from the sister Tragulina (represented by chevrotains and their relatives) within Ruminantia during the late Eocene. Phylogenetic analyses combining molecular and morphological data confirm this sister-group relationship, with Bayesian relaxed methods estimating the divergence at 44.3–46.3 million years ago. This split marked a critical point in , as Pecora began to exhibit traits like more complex cranial structures and enhanced hypsodonty, setting the stage for later ecological expansions. Alternative molecular timescales place the divergence slightly earlier, around 51.6 ± 4.9 million years ago in the early Eocene, highlighting some variability in clock calibrations but consistently supporting an Eocene origin. The initial diversification of Pecora accelerated in the (23–5 million years ago), coinciding with global climatic cooling after the Middle Miocene Climatic Optimum and the widespread expansion of C4 grasslands across and . This environmental shift, involving increased and seasonality, drove adaptations for mixed and diets, enabling pecorans to exploit newly available open habitats more effectively than their traguline relatives. These changes facilitated the of advanced digestion, with microbial communities optimizing fiber breakdown in grasses. Early Miocene fossils like Prodremotherium (approximately 20 million years ago from ) exemplify this phase, displaying primitive cranial features such as elongated, straight , short curved canines, and a relatively simple hornless , consistent with its position as a stem pecoran.

Fossil record

The fossil record of Pecora is relatively sparse during the Eocene and epochs, with transitional forms providing key insights into the early evolution of this suborder. Stem pecorans, such as those belonging to the family, including the Gelocus, are documented from deposits in , representing primitive morphologies that bridge non-pecoran ruminants and crown-group Pecora. These early taxa exhibit basicranial features and dental characteristics transitional to pecoran specializations, such as elongated and rudimentary pedicles that foreshadow the development of cranial appendages, though they lack fully formed horns. Fossils from sites like the Phosphorites du in highlight this phase, where gelocids coexisted with other early ruminants during a period of mammalian turnover linked to climatic shifts. The marks a significant radiation of Pecora, with genera like Prodremotherium and Gelocus giving rise to forms resembling early cervids and bovids across . Prodremotherium, known from early to middle localities in and , displays elongated limbs and dental adaptations indicative of habits, evolving toward the more specialized morphologies seen in later pecorans. Key sites, such as the Siwalik Group in , yield diverse assemblages from this period, including primitive pecorans with mixed tragulid-like and advanced pecoran traits, documenting the diversification amid expanding grasslands. This radiation reflects adaptive responses to environmental changes, with taxa transitioning from forest-dwellers to open-habitat grazers. During the and Pleistocene, the fossil record documents the diversification of modern pecoran families, with notable dispersals shaping continental faunas. The earliest Bovidae fossils appear around 18 million years ago in , with genera such as Eotragus known from sites in and . The family dispersed to during the middle , with early records from East African sites dating to approximately 16–18 million years ago, marking the initial radiation of horned ruminants in tropical environments. Cervidae underwent migrations to the approximately 5 million years ago via the , with the oldest North American records from late - deposits like the Ellensburg Formation in Washington, , representing initial colonization by Eurasian lineages. These events contributed to the establishment of diverse pecoran communities across hemispheres. Extinct pecoran groups, such as Prolibytheridae from the early of and , play a crucial role in elucidating the evolution of cranial appendages. Prolibytherium, characterized by bizarre, sexually dimorphic frontal structures—including butterfly-shaped ossicone-like projections in males and simpler forms in females—suggests basal homologies with later bovid horns and giraffid ossicones. Fossils from sites like Gebel Zelten in reveal these appendages as multifunctional, potentially for display and combat, informing models of appendage diversification within Pecora.

Taxonomy and classification

Higher classification

Pecora constitutes an infraorder within the suborder Ruminantia of the order Artiodactyla, the even-toed ungulates, encompassing all ruminant lineages except the basal (chevrotains). The infraorder is traditionally subdivided into two superfamilies: Cervoidea, which includes the families Cervidae (deer), (giraffes), and (musk deer); and Bovoidea, comprising (bovids such as cattle, antelopes, sheep, and goats) and (pronghorns). The of Pecora is robustly supported by molecular evidence, including shared (SINE) insertions unique to this lineage, such as a specific retroposon integrated in the common ancestor of cows, sheep, deer, and giraffes. Within the broader order Artiodactyla, now recognized as part of the clade Cetartiodactyla (which also incorporates cetaceans), Pecora forms a to (camels and relatives) in the ruminant-tylopod branch, with this combined clade diverging from the non-ruminant (pigs and peccaries) approximately 55 million years ago during the early Eocene. Early 20th-century taxonomic schemes often separated (giraffes and pronghorns) as a distinct superfamily from other pecorans, reflecting uncertainties in morphological character states like cranial appendages and dental features; however, cladistic analyses incorporating both morphological and molecular data in the 1990s confirmed the monophyletic structure of Pecora and resolved inter-superfamily relationships, integrating within the current framework.

Families and diversity

The infraorder Pecora encompasses five extant families, representing a total of approximately 200 species of advanced ruminants. These families exhibit significant , with varying widely among them and concentrated in specific geographic regions. The includes only one species, the (Antilocapra americana), which is endemic to open habitats in . The is the most species-rich family, comprising about 143 species such as antelopes, , sheep, and goats, and accounting for roughly 70% of Pecora's total diversity. Bovids dominate in and , particularly in east African savannas where peaks due to adaptive radiations into diverse ecological niches. The Cervidae contains approximately 50 species of deer, distributed widely across temperate zones of , , and introduced elsewhere. The consists of five species: the (Giraffa camelopardalis), (G. reticulata), (G. tippelskirchi), (G. giraffa), and the (Okapia johnstoni), all restricted to African forests and savannas. Finally, the includes seven species of (Moschus spp.), small-bodied forms inhabiting forested mountains of central and eastern . Families within Pecora are distinguished primarily by their cranial appendages, which serve functions in defense, display, and , setting them apart from the Tragulina's complete lack of such structures. Bovids possess permanent, unbranched horns consisting of a bony core covered by a sheath, present in both sexes in many species. In contrast, cervids bear deciduous antlers—branched, bony outgrowths shed and regrown annually, typically in males only. Antilocaprids feature forked pronghorns that are shed yearly, combining traits of both horns and antlers. Giraffids have skin-covered ossicones, while moschids lack horns or antlers altogether, relying instead on elongated upper canines as tusks. Recent taxonomic revisions, driven by molecular phylogenetic studies in the 2010s, have refined classifications within Pecora, notably in Cervidae where analyses of mitochondrial and nuclear DNA supported the splitting of the Capreolini tribe to better reflect evolutionary relationships among Old World deer. Additionally, in August 2025, the IUCN recognized four distinct giraffe species within Giraffidae, based on genetic, morphological, and ecological evidence, elevating former subspecies to full species status.

Anatomy and physiology

General morphology

Pecora exhibit a characteristic even-toed (cloven) hoof structure, where the weight is borne equally by the third and fourth digits, with the first digit reduced or absent and the second and fifth digits vestigial or lost. This adaptation supports their quadrupedal locomotion, with limbs featuring elongated metapodials and reduced side toes to enhance speed and endurance across diverse terrains. Body sizes vary widely within the group, ranging from approximately 7–18 kg in () to over 1,200 kg in adult male giraffes (), reflecting adaptations to different ecological niches. Most Pecora possess cranial appendages arising from the frontal bones, serving functions in defense, display, and . In , true horns are permanent structures with a bony core covered by a sheath that is not shed; in , pronghorns have similar structures but the sheath is shed annually, while Cervidae feature antlers that are branched, deciduous bony growths shed annually after the breeding season. display ossicones, which are skin-covered bony protuberances present in both sexes, and lack such appendages entirely. is pronounced, particularly in body size and the development of these appendages, with males typically larger and more ornamented than females. The adult dental formula of Pecora is typically I 0/4, C 0/1, P 3/2–3, M 3/3, lacking upper incisors and canines, which facilitates and . The molars are , featuring high crowns with complex folding enamel ridges suited for grinding tough, fibrous vegetation. Sensory adaptations include large eyes positioned laterally for a broad , aiding crepuscular and nocturnal vigilance against predators, and a well-developed vomeronasal (Jacobson's) organ that enhances acute olfaction for detecting pheromones and food sources.

Digestive system

Pecora possess a specialized four-chambered that enables efficient of fibrous plant material, distinguishing them from , which have a three-chambered stomach lacking a fully developed . The , the largest chamber acting as a fermentation vat, holds ingested material where microbes initiate breakdown; the mixes and softens the contents while aiding in regurgitation; the omasum absorbs water and volatile fatty acids; and the functions as the true stomach, secreting and enzymes for protein digestion similar to monogastrics. This multi-chambered structure allows Pecora to derive nutrients from cellulose-rich diets that other herbivores cannot efficiently process. The digestive process relies on microbial symbiosis in the rumen, where diverse communities of and degrade complex plant , particularly , into simpler compounds. These microbes ferment the substrates anaerobically, producing volatile fatty acids (VFAs) such as , propionate, and butyrate as primary end products, which are absorbed through the rumen wall to provide to the host. Protozoa and fungi also contribute by enhancing fiber breakdown and preventing bacterial overgrowth. Rumination, or cud-chewing, further optimizes by regurgitating partially fermented boluses from the into the mouth for re-mastication, increasing surface area for microbial access and promoting additional breakdown of tough plant fibers. This cyclic process, involving contractions to propel material upward, occurs for several hours daily and is essential for maximizing nutrient extraction from low-quality . The system achieves 50-70% digestibility of fibrous plants, with grass fiber often reaching 60-70% and legume fiber 40-50%, depending on plant type and lignin content. Adaptations include rhythmic forestomach contractions, occurring at rates up to 1-2 per minute in the rumen, which mix contents, expel gas, and facilitate digesta movement. These contractions maintain optimal pH (around 6.0-7.0) for microbial activity and prevent digestive stasis. Variations exist among pecoran families; for instance, giraffids exhibit smaller rumens relative to body size compared to ruminants, an suited to on higher-quality, less fibrous leaves that require less volume. VFA production from ruminal supplies approximately 70% of the animal's needs, underscoring the of this symbiotic process.

Distribution and habitats

Geographic distribution

Pecora, the infraorder encompassing advanced ruminants such as deer, , and antelopes, are native to every continent except and , with their distribution shaped by both natural evolutionary processes and human influences. The highest species diversity occurs in , particularly within the family , which dominates savannas and grasslands, while serves as a major hotspot for both and Cervidae, reflecting ancient radiations across the . The family Bovidae exhibits the broadest range among Pecora, spanning , , , and extending into through species like and . Cervidae, including deer and elk, are primarily distributed across the and , with species adapted to temperate forests and tundras from to . In contrast, Giraffidae is strictly endemic to , where and okapis occupy fragmented and forest habitats. Antilocapridae, represented solely by the , is confined to open plains and deserts of western . Moschidae, the , are restricted to mountainous regions of central and eastern , from the to parts of and . Human activities have altered Pecora distributions through introductions and extirpations. (Rangifer tarandus), a cervid, have been introduced by humans to regions beyond their native Eurasian and North American ranges, including from Siberian stock in the late 19th century. Similarly, axis deer (Axis axis) were introduced to , establishing feral populations that now impact local ecosystems. Historical migrations, such as those of cervids across Pleistocene land bridges like , facilitated the colonization of the from Eurasian ancestors. Conversely, overhunting has led to extirpations of deer species, including large-scale local extinctions of (Cervus elaphus) populations across parts of during the 19th and early 20th centuries.

Habitat preferences

Pecora exhibit diverse habitat preferences aligned with their ecological roles and family affiliations. Members of the family, such as antelopes and cattle, predominantly favor open grasslands and savannas, where expansive areas support on herbaceous . In contrast, Cervidae, including deer and , prefer forested woodlands and ecotones between forests and grasslands, environments conducive to on leaves, twigs, and shrubs. Giraffidae, represented by , occupy semi-arid savannas and open woodlands rich in tall trees, while certain bovid antelopes, like gazelles, adapt to arid deserts and montane regions with sparse . These species span broad altitudinal gradients, from to elevations exceeding 5,000 meters. For example, the (Pantholops hodgsonii) inhabits high-altitude alpine steppes and cold deserts on the at 3,700–5,500 meters, where low and extreme cold prevail. Water requirements vary significantly; many pecorans derive hydration from forage, but giraffes exemplify low dependency, obtaining most moisture from foliage and rarely drinking, which enables persistence in water-scarce savannas. Specialized adaptations facilitate exploitation of these habitats. Forest-adapted cervids possess pelage with disruptive patterns, such as spots on fawns, that mimic dappled filtering through the canopy for against predators. Giraffes' extended necks, reaching up to 2.4 meters, allow access to high browse in savannas, minimizing competition with shorter herbivores. Numerous pecorans, particularly bovids in dynamic ecosystems like the , undertake seasonal migrations to follow rainfall-driven forage availability, traveling to ungrazed patches during dry periods. Habitat loss severely threatens Pecora survival. fragments dense woodlands essential for (Moschus spp.), reducing cover and increasing vulnerability to and predation. Similarly, conversion of grasslands to cropland for diminishes foraging areas for grazing bovids, exacerbating population declines across open habitats.

Behavior and ecology

Social behavior

Pecora exhibit a wide range of social structures, from solitary lifestyles in species like and to large, dynamic herds exceeding 100 individuals in . In cervids such as deer, social groups often form matriarchal family units with multiple generations, while bachelor groups of young males are common outside breeding seasons. Bovids frequently display systems where territorial males maintain groups of females and offspring, as seen in populations, with similar systems in (Antilocapridae). Nursery herds provide collective protection for young. Communication among Pecora involves vocalizations, scent marking, and visual displays to convey information about identity, territory, and threats. Vocal signals include low-frequency grunts in cervids like caribou for maintaining contact within groups and alarm snorts in antelopes such as to alert others to predators. Scent marking is prevalent, with cervids using preorbital glands to deposit individualized odors on vegetation during aggressive or affiliative interactions, while bovids employ interdigital glands for similar spacing and recognition purposes. Visual displays, such as —a stiff-legged bounding leap—in gazelles and , signal fitness to predators or alert conspecifics to danger. Territoriality is prominent in many Pecora, particularly among males who defend ranges using cranial appendages through behaviors like sparring in pronghorns, where individuals clash horns to establish dominance. Alloparenting, though rare, occurs in some bovids, such as gaur where non-maternal females nurse unrelated calves, and in wildebeest nursery herds where group members assist in vigilance and care for young. Human activities have significantly altered social behaviors in domesticated forms like cattle, where intensive farming disrupts natural gregariousness and induces stress responses during handling, leading to manipulated herding patterns that deviate from wild bovid dynamics.

Diet and feeding

Pecorans exhibit primarily herbivorous diets, relying on plant material as their main food source, with distinct feeding categories based on species adaptations. Grazers, such as (Bison bison), predominantly consume graminoids and grasses, selectively cropping short vegetation in open grasslands to maximize nutrient intake from fibrous forages. Browsers, exemplified by giraffes (Giraffa camelopardalis), target leaves, twigs, and shrubs from trees and bushes, often accessing higher foliage unavailable to other herbivores. Intermediate or mixed feeders, like (e.g., Odocoileus spp.), combine grasses, forbs, and browse, adjusting based on availability to balance fiber and protein needs. Foraging techniques in Pecora are specialized to optimize energy acquisition while minimizing risks. Giraffes employ selective with their prehensile tongues—up to 45 cm long—and mobile lips to strip leaves from thorny acacias, avoiding spines and targeting nutrient-rich parts. In contrast, grazing species like use herd-based strategies, moving collectively across landscapes to lightly crop grasses, which reduces individual predation exposure and promotes efficient patch use. Across Pecora, daily intake typically ranges from 2% to 3% of body weight, supporting high-fiber and maintaining metabolic demands. Seasonal variations profoundly influence Pecoran diets and behaviors, driving adaptive shifts to ensure nutritional sufficiency. Many species undertake migrations to follow fresh growth pulses, as seen in (Connochaetes spp.), which travel vast distances across the Serengeti-Mara in response to rainfall-triggered grass regrowth, synchronizing with calving to exploit protein-rich vegetation. In temperate or harsh winters, fallback foods become critical; for instance, deer resort to bark, twigs, and woody stems when herbaceous plants are unavailable, providing essential but lower-quality energy. Rumen microbial communities adapt dynamically to these diet changes, altering volatile profiles—for example, increasing propionate production in grain-fed domestic ruminants to enhance energy yield from starch-rich feeds. Intraspecific and interguild shapes feeding , particularly for shared resources. Within grazing niches, Pecorans compete with equids (e.g., zebras and horses) for high-quality grasses, where equids' faster intake rates can displace ruminants from optimal patches, influencing coexistence through niche partitioning. Nutritional bottlenecks, such as sodium deficiency in low-mineral habitats like certain inland pastures, further constrain diets, leading to reduced intake and performance unless supplemented naturally via salt licks or geophagy. These factors underscore the interplay between strategies and environmental pressures in maintaining Pecoran nutritional .

Reproduction and life history

Mating systems

Pecora exhibit predominantly polygynous mating systems, where a single male mates with multiple females, a pattern driven by and resource availability. This includes resource-defense , in which territorial males defend areas rich in forage or water to attract females, as seen in antelopes such as the (Kobus ellipsiprymnus). Female-defense strategies involve males herding or tending groups of females, exemplified by ( ), where males form temporary harems during the breeding season. Lekking occurs in some , particularly gazelles and antelopes like the ( ) and (), where males aggregate in display arenas to perform rituals without defending resources, allowing females to select mates based on displays. Courtship in Pecora typically involves elaborate displays using sexual appendages, pheromonal signals, and with female estrus cycles, which last 18-24 days in most . Male deer engage in antler clashes during the rut to establish dominance and attract females, while sheep and goats feature horn-locking battles among to resolve . Pheromones released via or glandular secretions play a key role in signaling receptivity, particularly during the short estrus phase of 12-36 hours. These behaviors are influenced by social hierarchies, as detailed in discussions of . Sexual selection in Pecora favors larger males with superior horns or antlers, which confer advantages in male-male combat and female choice, leading to pronounced dimorphism across families like Cervidae and Bovidae. In deer and antelopes, victorious males secure more mating opportunities, enhancing their reproductive success through traits that signal genetic quality. Infanticide by incoming males occurs in some bovids, such as bighorn sheep (Ovis canadensis), to hasten the return of females to estrus by eliminating non-kin offspring, thereby accelerating the male's breeding window. Domestication has significantly altered natural mating systems in Pecora, particularly in (Bos taurus), where bypasses polygynous competition and allows for desirable traits. This technique, widely adopted since the mid-20th century, reduces disease transmission and enables use of superior sires across herds but disrupts traditional or territorial dynamics.

Development and lifespan

Pecorans exhibit viviparous with a synepitheliochorial , where embryonic development begins in the following fertilization. In representative species such as (Bos taurus), the reaches the 16-cell stage by day 4 and enters the , forming a by day 7 and around days 9–10. The then transitions from spherical to ovoid (days 12–13), tubular (days 14–15), and finally filamentous (days 16–17), elongating to up to 150 mm to enhance nutrient exchange with uterine histotroph. In sheep (Ovis aries), a close relative, the morula enters the by days 3–4, becomes a by day 6, hatches by days 8–9, and reaches the filamentous stage by days 12–17, extending to 25 cm. This elongation is driven by trophectoderm proliferation and is crucial for implantation, which begins around days 16–20 in and days 16–18 in sheep. Maternal recognition of occurs via tau secretion from the trophectoderm (days 13–17 in , days 10–21 in sheep), preventing luteolysis and sustaining the . In Cervidae, such as (Cervus elaphus), early embryonic development mirrors patterns but includes in some species like (Capreolus capreolus), where the remains dormant for 4–5 months before resuming growth. Without , as in (Odocoileus hemionus), the embryo develops continuously, with the appearing at 22% of and gastric structures forming by mid-. , including giraffes (Giraffa camelopardalis), show similar initial stages but with extended timelines due to prolonged . Gestation lengths in Pecora vary significantly by family and body size, reflecting adaptations to ecological niches. In , periods range from 120–150 days in small duikers to 300–330 days in (Syncerus caffer), with domestic at approximately 280 days, sheep and at 150 days, and pronghorn (Antilocapra americana, ) at 250 days. Cervidae gestations average 200 days, as in white-tailed deer ( virginianus). Giraffidae exhibit notably longer periods of 425 days in giraffes and about 450 days in (Okapia johnstoni), correlating with larger body masses and slower intrauterine growth rates (scaling as body mass^0.13). Shorter gestations in non-giraffid Pecorans (<300 days) enable higher reproductive rates and seasonal breeding, a key innovation distinguishing them from . Birth typically results in precocial young capable of standing shortly after delivery, though calves drop from heights up to 2 meters. Postnatal development involves rapid maturation; in calves and , microbial colonization begins within hours, with functional by 4–6 weeks, supported by rich in volatiles like butyrate. occurs at 2–6 months, depending on . is reached earlier in females (average 22 months) than males (28 months) across Pecora, with variations: smaller like mature at 6–12 months, while larger cervids like red deer reach maturity at 16–24 months for females and 24–36 months for males. Cranial appendages, such as horns or antlers, often develop around , signaling maturity. Lifespans in Pecora scale with body mass (as mass^0.15) and vary widely, influenced by predation, , and . In , wild (Bison bison) live up to 33 years, African buffalo to 29.5 years, and domestic average 20 years in . Cervidae show 10 years wild for but up to 26.8 years for . Giraffidae have extended longevities, with giraffes reaching 36 years wild or captive and up to 33 years in , exceeding expectations for their size due to low metabolic rates. Overall, wild lifespans are shorter than captive ones, with males often dying younger due to and competition.

References

  1. https://www.researchgate.net/publication/284807042_Pecora_Incertae_Sedis
  2. http://www.nhc.ed.ac.uk/index.php?page=493.170.276.278
  3. https://www.ultimateungulate.com/Artiodactyla/Ruminantia.html
  4. https://pmc.ncbi.nlm.nih.gov/articles/PMC9726890/
  5. https://www.tandfonline.com/doi/abs/10.1080/10292389409380449
  6. https://www.sciencedirect.com/science/article/abs/pii/S1367912016302851
  7. https://www.sciencedirect.com/topics/agricultural-and-biological-sciences/bovidae
  8. https://www.sciencedirect.com/science/article/pii/S0022030210001050
  9. https://www.sciencedirect.com/science/article/pii/S1631069111002800
  10. https://folia.unifr.ch/rerodoc/257202/files/men_mrm.pdf
  11. https://epub.ub.uni-muenchen.de/22383/1/zitteliana_2014_b32_02.pdf
  12. https://www.researchgate.net/figure/Biostratigraphy-of-Gelocidae-and-stem-Pecora-The-chronostratigraphy-and-biostratigraphy_fig5_265699560
  13. https://roar.hep-bejune.ch/documents/303012/files/MennecartB.pdf
  14. https://palaeo-electronica.org/2005_1/barry22/barry22.pdf
  15. https://pmc.ncbi.nlm.nih.gov/articles/PMC3751017/
  16. https://palaeo-electronica.org/content/pdfs/946.pdf
  17. https://www.tandfonline.com/doi/abs/10.1080/02724634.2010.483555
  18. https://pmc.ncbi.nlm.nih.gov/articles/PMC4668073/
  19. https://www.sciencedirect.com/science/article/abs/pii/S105579030600265X
  20. https://comptes-rendus.academie-sciences.fr/biologies/articles/en/10.1016/j.crvi.2011.11.002/
  21. https://academic.oup.com/mbe/article/14/5/550/994977
  22. https://animaldiversity.org/accounts/Antilocapridae/
  23. https://www.ultimateungulate.com/Artiodactyla/Bovidae.html
  24. https://animaldiversity.org/accounts/Bovidae/
  25. https://animaldiversity.org/accounts/Cervidae/
  26. https://giraffeconservation.org/state-of-giraffe/
  27. https://inaturalist.org/taxa/42140-Moschidae
  28. https://academic.oup.com/sysbio/article-pdf/52/2/206/19502988/52-2-206.pdf
  29. https://animaldiversity.org/collections/mammal_anatomy/horns_and_antlers/
  30. https://peerj.com/articles/8114/
  31. https://www.science.org/content/article/giraffes-are-four-distinct-species-major-report-confirms
  32. https://www.ultimateungulate.com/Artiodactyla/Moschus_moschiferus.html
  33. https://animaldiversity.org/accounts/Giraffa_camelopardalis/
  34. https://pmc.ncbi.nlm.nih.gov/articles/PMC8602029/
  35. https://pmc.ncbi.nlm.nih.gov/articles/PMC3151718/
  36. https://royalsocietypublishing.org/doi/10.1098/rspb.2011.0938
  37. https://www.sciencedirect.com/science/article/abs/pii/S0003996916302977
  38. https://onlinelibrary.wiley.com/doi/10.1111/1749-4877.12080
  39. https://www.researchgate.net/figure/Schematic-representation-of-the-stomach-of-tragulids-top-and-Pecora-bottom-Rum_fig1_260981666
  40. https://extension.umn.edu/dairy-nutrition/ruminant-digestive-system
  41. https://pmc.ncbi.nlm.nih.gov/articles/PMC3042666/
  42. https://pmc.ncbi.nlm.nih.gov/articles/PMC9656057/
  43. https://www.sciencedirect.com/science/article/pii/S0022030225000098
  44. https://pubmed.ncbi.nlm.nih.gov/9164243/
  45. https://www.tandfonline.com/doi/pdf/10.1080/00288233.1983.10427032
  46. https://www.sciencedirect.com/science/article/pii/S002231662207420X
  47. https://www.researchgate.net/figure/Relationships-between-body-mass-and-combined-intestine-mass-rumen-complex-and_fig1_277408484
  48. https://www.sciencedirect.com/science/article/abs/pii/S0377840104002299
  49. https://pubmed.ncbi.nlm.nih.gov/12746147/
  50. https://www.britannica.com/animal/bovid
  51. http://taxondiversity.fieldofscience.com/2018/07/pecora.html
  52. https://nhpbs.org/wild/cervidae.asp
  53. https://www.biologicaldiversity.org/species/mammals/giraffe/natural_history.html
  54. https://www.sciencedirect.com/topics/agricultural-and-biological-sciences/moschidae
  55. https://academic.oup.com/jhered/article/105/5/585/2961792
  56. https://pubs.usgs.gov/publication/70154790
  57. https://www.sciencedirect.com/science/article/abs/pii/S0031018208000266
  58. https://pmc.ncbi.nlm.nih.gov/articles/PMC4828584/
  59. https://www.nature.com/articles/s41598-024-63937-5
  60. https://animaldiversity.org/accounts/Pantholops_hodgsonii/
  61. https://pmc.ncbi.nlm.nih.gov/articles/PMC10705376/
  62. https://www.psu.edu/news/research/story/how-did-giraffe-get-its-long-neck
  63. https://www.sciencedirect.com/science/article/pii/S0006320702001593
  64. https://www.nature.org/en-us/about-us/where-we-work/united-states/stories-in-mn-nd-sd/beef-bison-help-fight-climate-change/
  65. https://portals.iucn.org/library/efiles/documents/NS-024-1.pdf
  66. https://www.sciencedirect.com/science/article/abs/pii/S0376635714003003
  67. https://www.researchgate.net/publication/395881420_First_Evidence_of_Allonursing_in_Gaur_Bos_gaurus_gaurus_Social_Flexibility_in_a_Translocated_Population
  68. https://jzar.org/jzar/article/download/769/465/6213
  69. https://extension.sdstate.edu/getting-started-bison-ranching
  70. https://www.iowabeefcenter.org/bch/DryMatterIntake.pdf
  71. https://www.go2africa.com/african-travel-blog/how-the-wildebeest-migration-works
  72. https://extension.umn.edu/planting-and-growing-guides/white-tailed-deer-damage
  73. https://pmc.ncbi.nlm.nih.gov/articles/PMC11394336/
  74. https://pubmed.ncbi.nlm.nih.gov/28313034/
  75. https://link.springer.com/article/10.1007/BF02359529
  76. https://pmc.ncbi.nlm.nih.gov/articles/PMC7297761/
  77. https://pubmed.ncbi.nlm.nih.gov/20875708/
  78. https://www.merckvetmanual.com/management-and-nutrition/management-of-reproduction-sheep/reproductive-physiology-of-sheep
  79. https://pmc.ncbi.nlm.nih.gov/articles/PMC4448612/
  80. https://pmc.ncbi.nlm.nih.gov/articles/PMC12509045/
  81. https://doi.org/10.3390/ani14131882
  82. https://embryology.med.unsw.edu.au/embryology/index.php?title=Deer_Development
  83. https://pmc.ncbi.nlm.nih.gov/articles/PMC8532601/
  84. https://www.merckvetmanual.com/multimedia/table/approximate-gestation-periods
  85. https://bioone.org/journals/annales-zoologici-fennici/volume-51/issue-1/086.051.0210/Old-World-Ruminant-Morphophysiology-Life-History-and-Fossil-Record/10.5735/086.051.0210.pdf
  86. https://sat.gstsvs.ch/fileadmin/media/pdf/archive/2011/11/SAT153110515.pdf
  87. https://pmc.ncbi.nlm.nih.gov/articles/PMC6093164/
  88. https://www.demogr.mpg.de/longevityrecords/0203.htm
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