Scientists have discovered a nearly complete skeleton of a baby bird only about the size of a cockroach—perhaps the smallest baby bird fossil ever found from the dinosaur era, according to a new paper ...

Biologists provide evidence that maximum body size in birds is constrained by the amount of time it takes to replace the flight feathers during molt. Why aren't birds larger? Fifteen-kilogram swans ...

Bird brains are the size of a nut, or possibly even smaller in some cases. But a plethora of new research shows that despite their small brain size, birds are actually among the most intelligent ...

Bird fossils from the Cretaceous (meaning before the asteroid) are limited because it’s hard to fossilise birds. They’re ...

Birds across the Americas are getting smaller and longer-winged as the world warms, and the smallest-bodied species are changing the fastest. Birds across the Americas are getting smaller and ...

Wow. A newly discovered flying bird species had a wingspan that stretched 24 feet long—as big as some aircraft. That’s pretty much a flying giant in the sky that’s twice as big as anything that can ...