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 ...

A piece from the American Institute of Physics points out that Gentoo penguins are the fastest swimming birds in the world, and that ability comes from their unique and sophisticated wings.

These are birds that are adapted through evolution for swimming, floating on the water surface, and in some cases diving in at least shallow water. The family contains around 146 species in 40 genera.