No, polar bear is a common noun, a general word for a type of bear. A common noun is capitalized only when it is the first word in a sentence.
A proper noun is the name of a specific person, place, or thing, such as Polar Bear International (conservation organization) or Polar Bear Drive, Westford, MA.
Yes, "Polar Bears" should be capitalized as it is a proper noun referring to a specific species of bear found in the Arctic region.
The collective noun for polar bears is a "celebration." So, next time you see a group of those fluffy white giants, you can say, "Look at that celebration of polar bears!" Just don't expect them to break out into a conga line or anything.
polar bears are related to bears.
Polar bears do.
They reproduce.
POLAR BEARS Polar bears actually grow pretty fast.
Polar bears are mammals.
humans are polar bears
Polar bears are 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.