I know for a fact that the scrotum temp must be around 34.5°C. Why not lower? Why low temp in the first place and why not high temp?
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I’ve always assumed the lower temperature incubation was for sperm thermotaxis (navigation by heat) but when I looked up the Wikipedia page on [sperm guidance](https://en.wikipedia.org/wiki/Sperm_guidance) the link isn’t there, so I assume a relationship hasn’t been fully investigated yet. It makes sense these two traits could be selected for together given their temperature relation. Someone else may be aware of more recent work that hasn’t made it into the hallowed pages of Wikipedia. They may not have an evolutionary link, that’s also possible.
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