High Hormone Levels In Seabird Chicks Prepare Them To Kill Their Siblings
Monday, June 23, 2008 - 11:28
in Biology & Nature
The Nazca booby, a Galápagos Island seabird, emerges from its shell ready to kill its brother or sister. Biologists have linked the murderous behavior to high levels of testosterone and other male hormones found in the hatchlings.