Polar bears are solitary animals, so there is not an officially recognized word for 'herd of polar bears', just as there is no word for 'herd of crocodiles'. In cases where other species of bears commonly live together, a group is called a 'sloth' (don't ask). Probably at some point someone just came up with the word because of the idea that if these solitary animals gathered for some reason (which is usually the discovery of a big juicy carcass or other source of food) they look like a group celebrating something with a good meal.
Polar Bears live in cold/arctic climates, and because the coldest climates are near the Earth's poles, they are named Polar Bears.
Polar bears are solitary creatures; normally the only group of polar bears is a mom and some cubs, a family group. However, when several polar bears do end up together, the collective nouns are an aurora of polar bears or a pack of polar bears. Although pack is one of the collective nouns given, I believe that it's a misnomer since a pack infers a group working together like a pack of dogs, wolves, or coyotes. But even when polar bears are together, they don't work together.
It depends on what about Polar Bears. One good topic sentence could be " Polar bears are cute and adorable fuzzy little creatures that are endangered." That could be a little bit of a run - on sentence, though. I think that if you are looking for a topic sentence for Polar Bears, this would be a good topic sentence.
Expository
A group of bears is called a sloth, a term first used in 1452, according to The Oxford English Dictionary. The actual phrase was "A Slouthe of Beerys" The word sloth derives from the Middle English term for slow, but it is a mystery as to why early writers thought that a group of bears moved slowly. It is also interesting to speculate about where groups of bears might have been seen. Maybe it was at some long-since-vanished site in Europe where bears congregated at a salmon stream to fish. Currently, one would be most likely to come across a sloth of polar bears on the coast of western Hudson Bay. Towards the end of summer, when the sea ice has melted, groups of males gather together on islands and points of land. When the sea freezes over again, they disperse to hunt seals. Sloths of grizzly bears can most easily be seen at salmon spawning streams, such as McNeil River, Pack Creek, and Brooks River in Alaska...
"A polar bear can swim like a fish," or "A polar bear swims like a dog: it always uses the doggie paddle when in the water."
A sleuth or a sloth of bears
It would be called the same thing. Unless it is a group of polar bears, then it would be called a Celebration. On the lighter side: A group of 100 bears would be called an uprising, and a time to panic, if you ask me!
their called a herd
Same for other bears: a sleuth, sloth or litter of polar bears.
Baby polar bears are called cubs.
Polar bears are solitary creatures; normally the only group of polar bears is a mom and some cubs, a family group. However, when several polar bears do end up together, the collective nouns are an aurora of polar bears or a pack of polar bears. Although pack is one of the collective nouns given, I believe that it's a misnomer since a pack infers a group working together like a pack of dogs, wolves, or coyotes. But even when polar bears are together, they don't work together.
New born polar bears are called cubs.
Mom bears are called sows.
Same for other bears: a sleuth, sloth or litter of polar bears.
Polar bears are called ice bears by some.
Polar bears are solitary creatures; normally the only group of polar bears is a mom and some cubs, a family group. However, when several polar bears do end up together, the collective nouns are an aurora of polar bears or a pack of polar bears. Although pack is one of the collective nouns given, I believe that it's a misnomer since a pack infers a group working together like a pack of dogs, wolves, or coyotes. But even when polar bears are together, they don't work together.
A male polar bear is called a boar.