Claim: Equidae includes species.

Equidae -LRB- sometimes known as the horse family -RRB- is the taxonomic family of horses and related animals , including the extant horses , donkeys , and zebras , and many other species known only from fossils . All extant species are in the genus Equus . Equidae belongs to the order Perissodactyla , which includes the extant tapirs and rhinoceros , and several extinct families .   The term equid refers to any member of this family , including any equine .