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One leading to the existing perissodactyl foot, and the other, apparently later, resulting in the artiodactyl type.
2
The fifth digit, for the same reasons as in the perissodactyl foot, first left the ground and became smaller.
3
These animals, which are grouped with the horse among the ODD-TOED (perissodactyl) mammals, are now verging toward extinction.
4
The tapirs are an ancient family which has changed but little since it separated from the other perissodactyl stocks in the early Tertiary.
5
In the further reduction of the perissodactyl foot, the fifth digit, being shorter than the remaining three, next left the ground, and gradually disappeared.
6
Modern perissodactyls exist as three small clades of threatened species: horses, rhinos, and tapirs.
7
Modern perissodactyls represent but a shade of their former glory.
8
Rhinos belong to a group of animals called perissodactyls.
9
Like the perissodactyls, they are descended from the primitive five-toed plantigrade mammals of the lowest Eocene.
10
Nobody is quite sure how perissodactyls evolved.
11
What is clear is that the early perissodactyls were the ancestors of rhinos, as well as all modern horses, zebras and tapirs.