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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.
Among living perissodactyls, body size, form of the upper lip, number and length
of horns, structure of the skin and colour pattern are the most important features
for classification. Annotated classification. The classification presented here ...
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This is the 198215th Edition, in two halves, with the Macropaedia and the Micropaedia. First published in 1768, the publisher is the oldest English-language encyclopedia still in print. Two Scottish ... Read full review
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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