He will often start off showing hysterical clients a photo book of "before" images--dogs with tumors the size of basketballs, cats with paralyzed hind legs--and "after" images of the healthy, perky animal.

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He might as well ask a camel to tap-dance on its hind legs.

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Roger sits sprawled in the straight-back chair that rears back on its hind legs.

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The gardens are alternately manicured and "like you're in Jurassic Park, " as Baker puts it, complete with foot-long collared lizards that run on their hind legs.

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Dr. RICHARDSON: Plus, we certainly remain very concerned that now - that we're having trouble with both hind legs at the same time.

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After an average of six weeks of training, food-motivated rats were able to walk on their hind legs, even with the treadmill switched off.

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The waves conceal whales, dolphins and sea turtles, and the western beaches are covered with armies of blue-backed soldier crabs that rear up on their hind legs and flee in panic at the approach of a human foot.

BBC: The perfect trip: Queensland

One points to a land origin in which lizards started to burrow, and as they adapted to their subterranean existence, their legs were reduced and lost - first the fore-limbs and then the hind-limbs.

BBC: Studying how snakes got legless

He was seen first by the gravedigger, a man who was nearly blind, and who did not trust his eyes to tell him that a tiger, braced on its hind legs, was rummaging through the churchyard garbage heap, mouthing thistles in the early-morning sunlight.

NEWYORKER: The Tiger��s Wife