Before revision: A particularly specialized form of thermoception is used by Crotalinae (pit viper) and Boidae (boa) snakes, which can effectively see the infrared radiation emitted by hot objects.E.
After revision: In animalsPositions of the pit organs (arrowed in red) on a python, relative to its nostril (black arrow)A particularly specialized form of thermoception is used by Crotalinae (pit viper) and Boidae (boa) snakes, which can effectively see the infrared radiation emitted by hot objects.E.