The only other birds allowed on the territory are female mates (and any visiting female that is looking to mate). Territorial social behavior is worthwhile when resources, usually food, are at ...

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.

Male hummingbirds are very territorial and can be remarkably feisty about defending their food sources.It makes sense ...

Birds trill, warble, ... “We found that highly territorial birds and omnivorous species were much more likely to be active singers during dawn hours,” Ramesh said.

ALBUQUERQUE, N.M. (KRQE) – The Cibola National Forest and National Grasslands issued a warning for visitors about territorial birds that have swooped down on visitors. A pair of Northern ...

Add in the fact that cassowaries are some of the most territorial birds on the planet, and there’s no confusion about how they earned their title of the world’s most aggressive bird.

A new study shows that one group of Galápagos yellow warblers responds to intruders more aggressively than others. It adds ...

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 ...

Bald eagles were endangered for decades. Now seen in places like Willand Pond in Dover/Somersworth and Rye Harbor, the bird's population is strong.

More than a billion birds die every year in the U.S. after colliding with buildings, a new study estimates. It's a much higher number than previous research suggested.