Gratifyingly for Dr Allman's theory, in both owl monkeys and titi monkeys, males live about 20% longer than females.
ECONOMIST: Why women outlive men
2.
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.
ECONOMIST: Why women outlive men
3.
That, however, suggests that female titi and owl monkeys must be involved in a life-shortening trade-off of their own.