What animal is similar to the polar bear?

Grizzly bears. They share some habitat areas. Eat alot of the same things, and even cross-breed occasionally. Grizzlies can also swim, but they can't tolerate the frigid waters as well. Their closer habitat companions, seals, are also mammals that share habitat areas. Both hunt for fish, but the seal is also a prey animal for the Polar bear.
Grizzlies and Polar Bears interbreed. That makes them pretty closely related. See link
Grizzlies and Polar Bears interbreed. That makes them pretty closely related. See link