New World owl monkeys 新世界猫头鹰猴
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.
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