#family_Equidae__Equidae  horses; asses; zebras; extinct animals
  supertype:  mammal_family  a family of mammals
  member of:  order_Perissodactyla
  member:  genus_Equus__Equus  type genus of the Equidae: only surviving genus of the family Equidae
     member:  horse__Equus_caballus  solid-hoofed herbivorous quadruped domesticated since prehistoric times
        member:  foal  a young horse
     member:  ass__as  hardy and sure-footed animal smaller and with longer ears than the horse
     member:  domestic_ass__donkey__Equus_asinus  domestic beast of burden descended from the African wild ass; patient but stubborn
     member:  mule  sterile offspring of a male donkey and a female horse
     member:  hinny  sterile offspring of a male horse and a female donkey or ass
     member:  wild_ass  any of several plain-colored equine mammals of Asia and northeast Africa
     member:  zebra  any of several fleet black-and-white striped African equines
     member:  Equus_quagga__quagga  mammal of South Africa that resembled a zebra; extinct since late 19th century
  member:  equine__equid  hoofed mammals having slender legs and a flat coat with a narrow mane along the back of the neck
  member:  genus_Hyracotherium__Hyracotherium  extinct horse genus; formerly called genus Eohippus
     member:  eohippus__dawn_horse  earliest horse; extinct primitive dog-sized 4-toed Eocene animal
  member:  genus_Mesohippus  a genus of Equidae
     member:  mesohippus  North American 3-toed Oligocene animal; probably not directly ancestral to modern horses
  member:  genus_Protohippus  a genus of Equidae
     member:  protohippus  Pliocene horse approaching donkeys in size
  member:  female_horse__mare  female equine animal

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