The brown bear [Ursus arctos], especially the Kodiak bear [Ursus arctos middendorffi]; and the polar bear [Ursus maritimus].
There are no bears in Antarctica (polar bears live in the Arctic), and their are no true bears in Australia (Koala Bears are marsupials, and not really bears at all).
Polar bears occur in the Arctic or northern hemisphere while all 17 species of penguins evolved in the southern hemisphere. Also penguin flesh is not particularly nutritious to a polar bear, which generally relies on pinniped or cetacean blubber to survive.
Polar and Brown Bears
Polar bears live in the Arctic, mostly around Canada. Penguins live in the southern hemisphere (there are no northern ones) and they would usually come from Antarctica or Australia, New Zealand etc.
no they do not.... polar bears live in the north, penguins in the south. Two different hemispheres.
Wolves and polar bears compete in the tundra, but wolves prefer to live where there is more prey. The following also live in the tundra: Arctic Fox, Arctic Hare, Caribou and Muskox.
Omnivores in the Arctic include polar bears, Arctic foxes, and various species of seabirds. These animals have adapted to the harsh conditions of the Arctic and have a varied diet that includes both plant material and prey like fish, birds, and seals.
Polar bears evolved in the Arctic, as they were once a race of the brown bear. In fact, the two only recently split around 400,000 years ago. There are not enough prey species in the Antarctic to support a large land predator.
Polar bears are larger and more powerful than the koala. Face to face the koala would die. However, given that koalas live in Australia and polar bears are only found in Arctic regions, the two would never meet or be in a position of confrontation. Also, koalas can climb trees which grow vertically. Polar bears would be unlikely to match this feat.
Polar Bears are mammals, and give live birth to usually one or two cubs.
Probably two large polar bears with aggression.
These two species are adapted to very different climates, therefore they would not live together.