Sharovipteryx, aka the Kite Lizard
Wings had to start somewhere, and that somewhere was apparently the unassigned area between the feet and ass. Meet the sharovipteryx, a clear case of a dinosaur evolving into a bird without ever actually seeing one. Its front forearms contained tiny little gliders, while the actual wings were attached to their very long hind legs, leaving scientists baffled as to how it could either fly or walk.
Quick: Picture every flying creature on Earth. Done? All right, how many of them fly with their legs? If you answered anything but zero, get out of the house now -- there's a gas leak. No flying animal has wing-feet. One theory is that bird legs are incredibly strong, and this strength allowed early birds to walk upright, which in turn allowed their increasingly strong breast muscles to develop into wings. That's why you never see kickin' little ankle-to-taint wings; the limbs would be too goddamned heavy to work.
However, it did give them prime twerking form.
So the sharovipteryx faced the ultimate in almost-bird dinosaur conundrums: If you walk with those legs, they become way too heavy and muscular to fly on, and if you fly with them, you're not walking anywhere. Some scientists, attempting to justify this thing's existence, theorize that the sharovipteryx actually had wing membranes between its legs and its arms, as well as membranes between its arms and its neck, making it more aerodynamic and shaped roughly like a kite -- hence the nickname.
They would then kill their prey with dive-bomb teabaggings.