Food is a factor, and birds will defend territory when it's scarce, but will not be so aggressive in an area with an inadequate supply. An error has occurred. Please ...

May 26 (UPI) --Territorial aggression between different species was thought to be rare, but new research suggests the behavior is surprisingly common among perching birds, a group that includes ...

Cardinals make it easy on us: There's no confusing those red-on-red males with any other bird in the back yard: If it's an all-over bright red with a crest on its head, it's a cardinal. Kids are ...

New research finds that territorial behavior and diet help explain why some birds sing more often at dawn, challenging traditional theories about dawn choruses. The study was published June 12 in the ...