Fierce female moles have male-like hormones and genitals. We now know how this happens. – Phys.org

Moles live a tough life underground. As a result, they’ve evolved helpful adaptations, such as excavator-like claws. Female moles in particular have evolved an unusual strategy: high levels of the male hormone testosterone.
This is an evolutionary advantage. It produces stronger muscles for digging and foraging and aggression, to help mothers defend themselves and their young.
Most of the year, female moles look and behave like males. They have masculinised genitals, with no external vagina and…

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