Did you know that there are some birds that can swim and fly? Did you also know that birds are descendants of a group of dinosaurs called theropods? Theropods are characterized by hollow bones ...

Hummingbirds have a ball and socket joint in their wings that allows them to move their wings in a figure-8 pattern ...

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 ...