Wingspan explicitly features birds as its central theme. The game mechanics are integrated with accurate and engaging information about different bird species, their habitats, and their behaviors.

Mariposas expands on Hargrave's theme of nature by focusing on the migration of monarch butterflies. The game blends educational aspects of butterfly life cycles with strategic game play.

Hargrave has shown a strong interest in themes of natural science. Her game designs reflect accurate research and thoughtful integration of scientific knowledge.