Polar Bear

"Bears: adorable at a distance. This is true in Minecraft, just as it is in real life. They may look huggable and furry, but they are full of teeth, and not too fussy about what, or who, constitutes a meal."

- Marsh Davies

Polar bears are neutral mobs that live in icy biomes.

Spawning
Polar bears are found in snowy tundra, snowy mountains and ice spikes biomes, in groups of up to four [ up to two in Bedrock Edition ]. If there is a group of two or more there is always only one parent, and the other one is a cub. They can also be found in deep and regular frozen oceans. Polar bears spawn at light level 7 or higher.

Polar bears can spawn on top of regular ice, but not packed ice or blue ice.

Drops
Polar bear drops: The fish will be raw, even if the polar bear is on fire when it is killed.
 * 0-2 : $3/4$ chance
 * 0-2 : $1/4$ change

Like other baby animals, killing a baby polar bear yields no items or experience.

Behavior
Polar bears can exist in a passive, neutral, or hostile state. The cubs are passive; adults are neutral. They will become hostile towards the player if they get too close to their cubs (this does not seem to happen as fast on easy difficulty). If a cub is attacked, all adults within a 41×21×41 cuboid will become hostile towards the attacker, regardless of difficulty (although in peaceful difficulty, their attacks will do zero damage to players). Attacking an adult who is within a 16×8×16 cuboid of a cub will also provoke other adults within a 21×21×21 cuboid of the attacked adult. Polar bears can be accidentally provoked by other mobs. Polar bears will also attack foxes. Adults will attack any fox that stays near it for a while, hitting it once (similar to how non-aggressive pandas and llamas will attack a mob or player once, every time they are struck) every few seconds. Cubs, however, are far more aggressive and will constantly attack foxes that are within 16 blocks of it.

Polar bears attack by rearing on their back legs and then mauling down on the attacker with their front paws. Their swimming speed is equal to the player's, making them difficult to get away from if they are attacking in water.

Polar bear cubs' growth cannot be sped up.

Data values
Polar bears have entity data associated with them that contain various properties of the mob.

Trivia

 * According to Jeb, polar bears were added after his son, Björn, was born. Coincidentally, "björn" is Norse for "bear".
 * Unlike most other baby mobs, polar bear cubs have a unique sound effect that is not just a sped-up version of the regular polar bear sound effects; this is also reflected in subtitles.
 * Polar Bears aren't monsters, yet are required for Monsters Hunted, and grant Monster Hunter.