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[R] Order of mammals which have substituted hooves (kind of thick horny part enclosing and covering the front of the last phalanx) for claws and have adapted for running. They are herbivorous. The body weight is borne only on the hooves.
The old classification separating the Perissodactyla (odd-toed Ungulates) from the Artiodactyla (even-toed Ungulates) tends nowadays to be replaced by one distinguishing between the Mesaxonia (with the axis of the limb passing through the 3rd digit, and the other digits vestigial or absent) and the Paraxonia (in which the axis of the limb passes between the 3rd and 4th digits, which are equal in length, and the other digits vestigial or absentn).
Artiodactyls are divided into 2 suborders: the Suiformes, which include the wild boar (Sus scrofa), a pest of the family Suidae, and the Ruminantia (ruminants), which comprise the red deer (Cervus elaphus) and the roe deer (Capreolus capreolus). The latter species is sometimes harmful.

[R] Images

* Extremity of the leg of an ongulate; foot prints of the boar (INRA)
Length of the segment: 2 cm.
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