Posted: Mar 20, 2012 4:03 pm
They are more caring because there is some reproductive advantage for the group to be caring. Follow the behavior in that light and you are more likely to find the process by which they became more caring.
Lifeboat for the rational mind :D
http://www.rationalskepticism.org/
http://www.rationalskepticism.org/viewtopic.php?p=1250246#p1250246