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Edition: Available editions United States. Become an author Sign up as a reader Sign in. Female moles evolved to have high testosterone levels, making them fiercer diggers and mothers. Female hyenas share this trait, but it means they must give birth through a male-like phallus.
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The secret to a long life? Matching sex chromosomes | Science | AAAS

Robert Mills does not work for, consult, own shares in or receive funding from any company or organisation that would benefit from this article, and has disclosed no relevant affiliations beyond their academic appointment. The prevailing view is that animals mainly have sex to reproduce. Until recently, therefore, scientists assumed that animals were relentlessly heterosexual. This is the message conveyed by countless zoos, wildlife documentaries, books and films. But arguing against these viewpoints, biologists such as Bruce Bagemihl and Joan Roughgarden have begun putting forward evidence that animal sexuality comprises an array of behaviours, gender expressions and body types. In fact, reproduction is marginal to many species.
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The secret to a long life? Matching sex chromosomes

Dating apps have reduced the ritual of human coupling down to a swipe. Creatures of all sorts have evolved some pretty spectacular strategies to woo their mates and ensure their genes carry on. Here are just a few examples of extreme courtship and copulation that put us tech-savvy humans to shame.
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From an evolutionary and biological perspective, animals are driven to have sex in order to procreate. But there is a lot more to sexual relations between animals. Animal sex is at least as strange and varied as human sex.
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