Scientists suggest that bigger brains in bird ancestors led to more flexible skulls, playing a key role in their evolution.

Yet birds differ from their reptile ancestors in many important ways. A turning point in their evolution was the development of larger brains, which in turn led to changes in the size and shape of ...

All of the flightless birds alive today evolved from ancestors who could fly and later lost that ability. "Going from something that can't fly to flying is quite the engineering challenge ...

They found that when birds evolve from a flying ancestor to a new flightless form, the birds' bodies, including the ratio of their wings and tails, change before the feathers do. Insights from ...