Socialization: chimpanzees learn technology by imitating each other, just like humans do. User mayonesa, in the New Right, Traditionalist, Conservationist and Integralist News subreddit, 01 Feb 2013
PLOS ONE: Basis for Cumulative Cultural Evolution in Chimpanzees: Social Learning of a More Efficient Tool-Use Technique User jalees, in the Reddit Science subreddit, 31 Jan 2013