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[John Terborgh] Because there are so many
of them in relation to the food resources that they need to survive,
these animals turn antisocial, they fight a lot whenever there’s an
attractive food resource, and so we see their group structure completely
breaking down, we don’t record any grooming behavior, the young don’t
play, we do not see any of those behaviors. On tiny islands, where there
are trapped howler monkey groups, the animals are completely silent.








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