"Friendship is one of these things we all think we know it so well," she says. "It turns out that people have very different definitions or bring up different things when you ask them what friendship is and it's kind of squishy in a way, because it doesn't have the legal and institutional parameters like other kinds of relationships do" In evolutionary biology and primatology, similar themes come up all the time: friendships are long-lasting but they don't have to be the same people forever.

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