Altruistic Behavior in Green-bearded Lizards

This is an old article but it deals with a subject I've written about at some length in the past, and that is the evolution of altruistic behavior (other writings can be found here and here).From sciencedaily.com:Greenbeards Have Blue Throats In Breakthrough Study Of Evolution Of Altruistic BehaviorScienceDaily (May 4, 2006) — SANTA CRUZ, CA--A new study of side-blotched lizards in California has