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The Power of Friendship and Violence in the Wild
With friendliness, they are very strong to support each other. They depend on the close friendships, which they express through physical contact and particularly through grooming. So this is a major expression of interest in somebody else. And it can go on for half an hour or even an hour. It's partly looking for parasites but mostly it's just soothing. This is a long-lived individual. Obviously, these killings can't have very often because otherwise they'd all be dead.