What does the joke about polar bears plucking their hair mean?

This is a cold joke. Polar bears live in the North Pole, where it is very cold. Polar bears rely on their fur to keep warm. When they pull out all the hair, it will definitely get cold. This polar bear is stupid.

Adult polar bears can stand up to 2.8 meters in height and shoulder height 1.6 meters. Male polar bears weigh 300~800 kg, and female polar bears 150~400 kg. Fat will accumulate in large quantities before winter comes, and their weight can reach more than 800 kilograms.

Extended data

Polar bears generally have two hunting modes, and the most commonly used method is "waiting for the rabbit". They will find the seal's breathing hole on the ice in advance and wait patiently for several hours. As soon as seals appear, they will launch a sudden attack and drag them up from the breathing hole with sharp claws.

Polar bears are such excellent swimmers that they were once considered as marine animals. Polar bears spend most of their lives (about 66.6%) in a "static" state, such as sleeping, lying down, or waiting for prey.