Cooperative Breeding (caring for unrelated children within the group) Increases in Harsh Environments User ackhuman, in the Reddit Science subreddit, 26 Nov 2013
PLOS ONE: Simulating the Evolution of the Human Family: Cooperative Breeding Increases in Harsh Environments User burtzev, in the Evolution subreddit, 25 Nov 2013
Cooperative breeding increases in harsh environments, study that investigates the evolution of a population under conditions of different environmental harshness and in which selection can occur at the level of the group as well as the level of the individual, shows User mubukugrappa, in the Reddit Science subreddit, 21 Nov 2013