Monday, 7 September 2009

Infrared sensitivity

Pit vipers, pythons, and some boas have infrared-sensitive receptors in deep grooves between the nostril and eye, although some have labial pits on their upper lip just below the nostrils (common in pythons) which allow them to "see" the radiated heat.[33] Infrared sensitivity helps snakes locate nearby prey, especially warm-blooded mammals.

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