Reggie Ekorusさんのイラストまとめ
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He/Him Bio student, artist, museum volunteer, urban musher, giant weasel
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Ultimately both configurations allowed mammals to scamper their way across the globe and into the modern day.
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And in placentals, the testicles went to the back with the vas deferens looping around the ureter:
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A hypothesis for why these sacks evolved in the first place has to do with the way mammals run around. Mammals tend to run in a way that causes the spine to arch and curl forwards, and it’s possible this motion may have caused trauma to the testes, reducing their fitness.
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Mammals, like other vertebrates started out with internal testes located near their kidneys, kinda like this:
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