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 ...

Every autumn, billions of birds leave their breeding areas when the temperature drops and food gets scarce to spend the winter in more favorable climes, returning the following spring when warm ...

This article originally appeared on The Conversation. Aside from being a delight to watch, flight in birds is regarded by many cultures as a symbol of freedom, and a source of inspiration for humans ...