What specialized heat-sensing organs are located between the eye and the nostril of *Crotalus oreganus*?

Answer

Deep facial pits sensitive to infrared radiation

Pit vipers, including *Crotalus oreganus*, possess specialized loreal pits, which are deeply recessed holes situated on the face, specifically located between the eye and the nostril on each side of the head. These organs are critically important for survival and hunting as they are incredibly sensitive to infrared radiation. This sensitivity allows the snake to create a 'heat signature' image of warm-blooded prey, enabling effective targeting and striking even in conditions of complete darkness. The presence of these pits is a definitive feature distinguishing pit vipers from many non-venomous mimics.

What specialized heat-sensing organs are located between the eye and the nostril of *Crotalus oreganus*?
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