Equis sexiweb 1987
With the exception of the domestic horses, which have long manes that lay over the neck and long tail hair growing from the top of the tailhead or dock, most equines have erect manes and long tails ending in a tuft of hair.
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.The oldest material to date was found in Idaho, USA.Molecular phylogenies indicate that the most recent common ancestor of all modern equines (members of the genus Equus) lived ~5.6 (3.9-7.8) mya.Direct paleogenomic sequencing of a 700,000-year-old middle Pleistocene horse metapodial bone from Canada implies a more recent 4.07 mya for the most recent common ancestor within the range of 4.0 to 4.5 mya. quinni) probably all belong to a second species that was endemic to North America. The most common hybrid is the mule, a cross between a male donkey and a female horse.
All species are herbivorous, and mostly grazers with simpler digestive systems than ruminants but able to subsist on lower quality vegetation.