Polar bears should fish by the water

Polar bears are one of the most boring mobs in the game.
Usually, players avoid them so as not to provoke them. So it should be, you have to do the same in real life, but at least let the bears have some unique behavior that would be interesting to watch.

Let the polar bears catch fish when they are near the water, occasionally dragging them onto the ice as an item. And also let the baby bears learn how to do it too.

This will make polar bears more interesting mobs and sometimes even useful if the player can manage to pick up the caught fish and avoid the bear's attack.
But bears should only fish in snowy biomes, so that players won't be tempted to take the bear home and make them their "pet fisherman".