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9 nearly hairless mammals

By: Bryan Nelson on Nov. 18, 2013, 9 a.m.
A naked mole rat in a pipe

Photo: belizar/Shutterstock

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Naked mole rat

Nudity might be the least bizarre trait of these oddball rodents. Unlike most mammals, naked mole rats don't regulate their own body temperature and don't have any pain receptors in their skin, likely an adaptation to their burrowing lifestyle. They are also the only known eusocial mammals, meaning their social structure closely resembles that of insects like ants or bees.