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Polar bear | Description, Habitat, & Facts | Britannica
Polar bear - Wikipedia
Polar Bear | Species | WWF - World Wildlife Fund
Top 10 facts about polar bears - WWF
Polar Bears 101 | Nat Geo Wild - YouTube
Polar Bear - National Geographic
Polar Bear Facts | Polar Bears International
Polar Bear Fact Sheet | Blog | Nature - PBS
Polar Bear photos, facts, and map - National Geographic Kids
Polar Bear Facts - North American Bear Center