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 ...

The study found that bird species who nest in tree cavities have independently evolved heightened aggression across lineages, particularly in females. Scientists have long wondered whether evolution ...

"We are warning local people and particularly those with small children to be on their guard and not to approach the bird, which poses a very real threat to the public due to its size, aggressive ...