Bears eat fish.  The most important bears get the best fishing spots along the river. (They are in it too.)

Polar bears are the biggest species of bear. They have the most unique heating system too!  The warm blood from their heart goes to their skin. 

Then the cold blood returns from their skin and gets heated at the heart for travel back to the skin.

~~Hi Fishy! I'm going to eat you!~~

Grizzly bears stand on their hind legs to look more intimidating.  When they emerge from hibernation, they immediately go to the rivers and streams to catch the fish that are migrating from the ocean.

Pandas are bears that eat bamboo.

When cubs are young, they play to learn hunting skills.