Male caregiving is rare. Of the nearly 6,000 mammalian species, fewer than 5% of fathers stick around to raise their own young. Most are even instinctively hostile. Even among the mammals that pitch in with caregiving duties, including humans and a handful of rodents, there's still a range in caregiving quality, from contenders for "dad of the year" to—at worst—abusive.

Male caregiving is rare. Of the nearly 6,000 mammalian species, fewer than 5% of fathers stick around to raise their own young. Most are even instinctively hostile. Even among the mammals that pitch in with caregiving duties, including humans and a handful of rodents, there’s still a range in caregiving quality, from contenders for “dad of the year” to—at worst—abusive.

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