The horse (Equus ferus caballus)[two][3] is among two extant subspecies of Equus ferus. It is an odd-toed ungulate mammal belonging on the taxonomic spouse and children Equidae. The horse has developed over the past forty five to 55Â million a long time from a little multi-toed creature, Eohippus, into the big, solitary-toed animal of now. People