Still from animated sequence of a horse pacing. Photos taken by <a href="//commons.wikimedia.org/wiki/Eadweard_Muybridge" title="Eadweard Muybridge">Eadweard Muybridge</a> (died 1904), first published in 1887 at Philadelphia (Animal Locomotion). Animation by <a href="//commons.wikimedia.org/wiki/User:Waugsberg" title="User:Waugsberg">Waugsberg</a>, 2006-10-8. (The sequence is set to motion using frames of Human and Animal Locomotion, plate 591, "Pronto" pacing)
Eadweard Muybridge, <a href="//commons.wikimedia.org/w/index.php?title=User_Waugsberg&amp;action=edit&amp;redlink=1" class="new" title="User Waugsberg (page does not exist)">Waugsberg</a>, <a href="//commons.wikimedia.org/wiki/User:Mosmas" title="User:Mosmas">Mosmas</a>
Unknown source<span style="display: none;">Unknown source</span>