Infrahuman altruism.
D000818:Animals; D001522:Behavior, Animal; D004285:Dogs; D004289:Dolphins; D004645:Empathy; D000882:Haplorhini; D006801:Humans; D008251:Macaca; D009042:Motivation; D002679:Pan troglodytes; D011678:Punishment; D051381:Rats; D012201:Reward; D012919:Social Behavior; D012951:Socialization