In spite of their reputation as living dinosaurs, birds have come a long way since the days of T. rex and friends.
Gone is the toothy rostrum, replaced by the more familiar beak. Their skeletons have adapted for flight, as have their forelimbs. Even their pelvis is twisted into a shape that their more ancient ancestors would barely recognize.These changes weren't spontaneous developments, nor are they absolute. For a brief period early in their development, in fact, birds of all variety grow a pelvis that wouldn't have looked out of place as part of a fossilized dinosaur's skeleton.
"It was unexpected to find these initial stages of bird development look so much like the hips of an early dinosaur,"Christopher Griffin, an evolutionary biologist from Yale University with a particular interest in the history of vertebrates. of a hunting theropod, to the Mick Jagger strut of a chicken – it's not hard to imagine the kinds of changes required of their bones and muscles.To accommodate changes to their movement style, their ilium extends more towards their chest and bum, carrying their body's bulk; their pubic bone tilts backwards rather than faces forward, with the pubis bones left wide open.
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