Whales have lost their hind legs (the front ones are now their
flippers), and we have a pretty good fossil record of how they did so, thanks
in large part to the work of Phil
Gingerich (see his great whale evolutionsite here) and his collaborators.
Although whales lack external
hind legs, they do have internal rudiments of the hind limbs and pelvic girdle,
as seen at the top of the above image, which goes through the evolutionary
process of how whales came to be. I think whales having legs is pretty much the
most fool proof way of proving evolution.
Also this, because it made me laugh
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