Sunday Express Skeleton 24Th November...
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http://news.bbc.co.uk/1/hi/sci/tech/2129395.stm
An elephant's foot (not the plant variety) closely resembles the plantigrade foot of man, except that the heelbone rests on a thick pad of flesh. Thus the elephant's hind leg has no conspicuous heel or hock joint as does the hind leg of a horse or dog. The free joint is the knee, and the elephant is one of the few animals that can kneel on its hind legs.