Equus (genus) 54 million years ago (Mya). These animals had three toes on the hind feet and four on the front feet with small hooves in place of claws, but also had soft pads.<ref name="doi10.1126/science.1105458"></ref> Equids developed into larger, three-toed animals (e.g. "Mesohippus") during the Oligocene and Miocene. From there, the side toes became progressively smaller through the Pleistocene until the emergence of the single-toed "Equus". The genus "Equus", which includes all extant equines, is believed to have evolved from "Dinohippus", via the intermediate form "Plesippus". One of the oldest species is "Equus simplicidens", described as zebra-like with a donkey-like head shape.
Equus (play) the owner of the stables, Harry Dalton, and Alan agrees. Dysart meets with Dalton, who tells him that he first held Alan to be a model worker, since he kept the stables immaculately clean and grooms the horses, including one named Nugget. Through Dysart's questioning, it becomes clear that Alan is erotically fixated on Nugget (or 'Equus') and secretly takes him for midnight rides, bareback and naked. Alan also envisions himself as a king, on the godhead Equus, both destroying their enemies. Dysart gives Alan a placebo "truth pill". Revealing a tryst with Jill, he begins to re-enact the event.