The antennae of Rhodnius bugs detect heat from their potential victims using numerous sensitive, hairlike thermoreceptors.

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"Rhodnius bugs are large, blood-sucking insects found throughout the Americas. They live in close proximity to their victims, in nests or burrows, and detect potential victims -- small, warm-blooded creatures such as mice -- by sensing their body heat. A Rhodnius bug has its own built-in thermometers on its antennae in the form of numerous exceedingly sensitive hairlike thermoreceptors, which can detect air that has been warmed by its prey's body heat." (Shuker 2001:38)

The Hidden Powers of Animals: Uncovering the Secrets of NatureAugust 4, 2020
Dr. Karl P. N. Shuker

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