Finches add cigarette butts to their nests to ward off pests
June 27, 2017, 1:27 a.m. by Bryan Nelson
It's the equivalent of chemical warfare in the animal kingdom.
Vulture dads take in abandoned egg, raise chick as their own in Amsterdam
June 1, 2017, 11:34 a.m. by Noel Kirkpatrick
The two vultures took turns sitting on the egg until it hatched.
Young cowbirds don't know they're really cowbirds until they hear this special song
May 17, 2017, 7:05 a.m. by Jaymi Heimbuch
These songbirds need a vocal clue to unlock their true identity.