Infant titi and owl monkeys spend much of their time clinging tenaciously to their fathers' fur.
ECONOMIST: Why women outlive men
That, however, suggests that female titi and owl monkeys must be involved in a life-shortening trade-off of their own.
Gratifyingly for Dr Allman's theory, in both owl monkeys and titi monkeys, males live about 20% longer than females.
In both titi and owl monkeys, the father assumes the critical duty of carrying his children around until they are able to move safely and independently through the trees.
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