Uploaded May 2026 | Updated September 2026, 2 weeks ago

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So, from what I've read, early mammals all had internal testes. And it's not entirely clear why descended testes evolved. It likely has to be with temperature, both for storage and for sperm activation.
See more: sciencenews.org/article/why-some-mammal-species-dont-have-descended-testicles

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