Kin altruism can look like altruistic behaviour whose evolution is driven by kin selection. Inclusive fitness is not limited to cases where "kin" ('close genetic relatives') are involved. The monastery became the spiritual focus of the tribe or kin group. These toads likely recognize and actively avoid close kin as mates. Their language became estranged from that of their kin who sailed over sea. Historically clans organized around successful hunters and their kin. These chemicals also contribute to recognition among individuals, kin, and nest mates. He has collaborated with Geff Harrison of Kin Ping Meh fame. One of his first royal acts was to execute all of his royal kin. The Raiders then refused to fight the humans, for fear of harming their Cylon kin. Killer whales imitate others, and seem to deliberately teach skills to their kin. He also played guitar with Steve Pride and His Blood Kin and Gator Alley. Evolutionary game theory explains this altruism with the idea of kin selection. Other states also commonly prohibit marriages between such kin. They were then given a choice to share the food with kin or nonkin.