Muybridge resumes his work on photographing horses in motion at Stanford's Palo Alto Stock Farm. He develops a system using multiple cameras with trip wires to capture a sequence of images showing the horse's movements.

Muybridge successfully captures a series of photographs that clearly demonstrate that a horse does indeed have all four hooves off the ground at one point during its stride. These images cause a sensation and validate Stanford's theory, though it also strains their relationship as Stanford tries to take credit.

Funded by the University of Pennsylvania, Muybridge expands his research to include a wide variety of animals and human subjects. He photographs them in motion, capturing detailed sequences of their movements. This project is massively expansive.

Muybridge publishes 'Animal Locomotion,' a monumental collection of over 20,000 photographs documenting the movements of animals and humans. This work becomes a foundational resource for artists, scientists, and students of anatomy and motion.