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Old 03-25-2018, 04:58 PM   #5
Anthony
 
Join Date: Feb 2005
Location: Berkeley, CA
Default Re: Infra-red vision vs. dark vision...

Quote:
Originally Posted by Johnny1A.2 View Post
Assuming a fairly realistic human-like hominid eye, for a hominid adapted to spending large amounts of time (but not all the time) underground, which adaptation likely would be more viable, and more sense biologically/physically?
Infravision sufficient to detect a person is probably not possible for an exotherm, though there are endotherms (pit vipers) with a primitive version, and there's certainly no easy evolutionary path that leads to it. Night vision adaptations are more possible but won't do a lot of good underground, as they only work in conditions of low light, not no light. Echolocation (in GURPS, probably a low res air sonar) is an option but again there's no easy evolutionary path.
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