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Why do male mammals risk having the testicals outside the main body?
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Why do male mammals risk having the testicals outside the main body?

User Maricela
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Answer is to keep the testicles cooler than the body

Reason - the temperature of the testicles needs to be cooler than the inside of the body to produce sperm. This is why the testicles are located outside of the body.
User Ellis Valentiner
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