Question

animals & plants
why are polar bears difficult to detect on infrared cameras?
they burrow beneath the ground
they are camera shy
they are camouflaged against the snow
thick fur means body heat doesnt escape

Explanation:

Infrared cameras detect heat. Polar bears have thick fur. Thick fur insulates, reducing heat escape. So infrared cameras struggle to detect them.

Answer:

Thick fur means body heat doesn't escape.