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Following completely different evolutionary paths, both perissodactyls and
artiodactyls (e.g., cattle, antelope, swine) independently evolved features such as
high-crowned grinding teeth and elongated limbs with a reduced number of digits
In all living perissodactyls the terminal digital bones are flattened and triangular,
with evenly rounded free edges, and are encased by keratinous hooves derived
from the integument. The single hoof of the equids — the only mammals to walk ...
In the equids the proximal end remains as a small splint of bone, while the distal
end has fused with the tibia. The arrangement of the small bones of the carpus ("
wrist") and tarsus (ankle) is another characteristic feature of perissodactyl limbs.
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The New Encyclopaedia Britannica (Encyclopaedia)User Review - Not Available - Book Verdict
For virtually all its 238 years,Britannica has ruled the shelves as a peerless general encyclopedia. Reviewers have consistently given it high marks for most of the 12 criteria identified inKister's ... Read full review