When temperatures are scorching, southern yellow-billed hornbills in the Kalahari Desert of southern Africa dilate blood vessels in their beaks to thermoregulate and cool off, according to a new study ...
These are thermal images of a female Southern Yellow-billed Hornbill (Tockus leucomelas) at different air temperatures. Surface temperature (°C) is shown by the scale bar to the left of each image.
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