Any animal learns to sort out the data it can sense from the “noise” of the environment. For clarity in the movies, we show the heat signature of a human as red against a non-red background. But what’s really happening is the Shrieker or AB is seeing the difference between the two temperatures. The creature is actually seeing infrared coming from both sources, but because the human is usually warmer than the desert background, the shape stands out. It would work on a 105 degree desert day, too, because the human would be cooler (giving off less heat) than the background and would still stand out. The only time the creature might have trouble would be on a day when it was exactly 96 degrees and humans were neither hotter nor cooler that the surrounding objects.
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