Humans
Friendship: Do animals have friends, too?
Whether you're a human or a horse, it takes a lot of brainpower to support a complex social group – and that puts a limit on how many friends we can have
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Whether you're a human or a horse, it takes a lot of brainpower to support a complex social group – and that puts a limit on how many friends we can have
The four-year war that shattered a chimp society in the 1970s shows similarities between the ways chimpanzee and human societies break down