RAPID metamorphosis may explain why beetle species are numerous enough to overwhelm almost any other creature on Earth. The superfast evolution of the male dung beetle's penis to wildly differing sizes in the same species could mean that new species appear within a few years rather than over millennia.
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The most striking difference was between beetles in Western Australia who had small cars and big genitals and those in the US who had the complete opposite.
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XD
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