Scientists suggest that bigger brains in bird ancestors led to more flexible skulls, playing a key role in their evolution.

No other birds on earth have anything like it. Unlike with rams and rhinos, the screamer’s horn doesn’t seem to be a weapon, because it is only loosely attached to the skull and known to snap ...

A 69-million-year-old skull found in Antarctica belonged to what scientists say is the oldest known modern bird. An early relative of the continent’s ducks and geese, it lived off the Antarctic ...