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Inside the Fortress
1m 17s
Admiralty Island hosts the largest concentration of brown bears in the world.
NATURE brings the beauty and wonder of the natural world into your home, becoming in the process the benchmark for natural history programs.
Video description: "Animal Homes: Cities" features a colony of over 40,000 puffins filmed from every angle imaginable. Cinematographer Mark Carroll explains how he got the close-ups using small GoPro cameras and the clever use of puppets.