According to a team of scientists led by Dr Amiyaal Ilany of the University of Pennsylvania, spotted hyenas (Crocuta crocuta) prefer to have friendship relations with friends of their friends. Spotted hyenas (Crocuta crocuta). Image credit: Steve Jurvetson / CC BY 2.0. The scientists collected more than 55,000 observations of social interactions of spotted hyenas (also known as laughing hyenas) over a 20 year period in Kenya, making this one of the...