A 56 million-year-old fossil bone helps explain how this (mostly) flightless family of birds spread to so many different ...

More than 99% of birds can fly. But that still leaves many species that evolved to be flightless, including penguins, ostriches, and kiwi birds. In a new study in the journal Evolution, researchers ...

According to bird experts Kenn and Kimberly Kaufman, much about bird flying is dependent on the species, season, and what else the bird is doing. Songbirds that feed on insects vary in the elevation ...

Scientifically known as Gallus gallus domesticus, chickens are one of the most widespread and common domesticated animals in the world. The global chicken population reached over 33 billion, with ...