Which type of bear is fittest for the environment?

There is no one "fittest" type of bear, as different bear species are adapted to different environments. For example, polar bears are well-adapted to the Arctic environment, with their thick fur and ability to swim in icy waters. Grizzly bears are well-adapted to mountainous regions, with their strength and ability to climb trees. Brown bears are versatile and can adapt to a variety of habitats, from forests to tundra. Ultimately, the fittest type of bear is the one that is best adapted to its specific environment.