Thermal cameras detect the heat lost by a subject as infrared radiation. Since polar bears are experts at conserving heat using their thick layer of fat under the skin, heat released by the polar bears are usually undetectable by thermal cameras.
Why Are Polar Bears Nearly Undetectable by Infrared Cameras?

Why Are Polar Bears Nearly Undetectable by Infrared Cameras?
Polar bears are experts at conserving heat using their thick layer of fat under the skin, thereby concealing the heat released by their body.
Article by Aishwuriya Kunashankar
. 18/05/2022
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