Maybe to see how long they are? Or this person could mean, why do we need to measure the population of polar bears. If this the actual question then the answer is basic. They (whoever they may be) need to keep records of polar bear populations in order to declare them on the endangered list. If they go onto the endangered list they can be better looked after by the international community. (Whether the international community cares or not is another question.)
polar bears are related to bears.
Polar bears do.
They reproduce.
POLAR BEARS Polar bears actually grow pretty fast.
Polar bears are mammals.
Polar bears are bears
humans are polar bears
A sleuth or a sloth of bears
There are no polar bears in Antarctica. If there were, they would eat the penguins.
Polar bears are animals of Arctic regions. The only polar bears here are in the NC Zoo.
on a polar bears arssseee on a polar bears arssseee on a polar bears arssseee
yes, polar bears have fur.