Penguins, for instance, can't fly, but they swim in a way ... For newly flightless birds, maintaining a flight-friendly skeleton is a bigger unnecessary cost than keeping some of their old ...
It's difficult to know what birds "think" when they fly, but scientists in Australia ... digital "endocasts" from the area inside a bird skeleton's empty cranial space. Published in Biology ...
After losing the ability to fly, birds lose those feather features in ... feathers — so evolution “prioritises” changing the skeleton before the majority of the feathers.
Penguins, for instance, can't fly, but they swim in a way ... For newly flightless birds, maintaining a flight-friendly skeleton is a bigger unnecessary cost than keeping some of their old ...