Grizzly bear Brutus and naturalist Casey Anderson set out to chronicle the lives of Yellowstone's vulnerable grizzly bears.

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Image: Casey feeding Brutus

Expedition Grizzly,Casey Anderson feeding Brutus a treat with wild flowers in background. Anderson has raised and taken care of Brutus since he was five months old.

Image: Casey at Yellowstone

Expedition Grizzly,For about a year, Casey Anderson has been observing and studying grizzly bears at Yellowstone National Park.

Image: Brutus roars

Expedition Grizzly,Casey Anderson has raised and taken care of Brutus since he was five months old. Brutus "roars" for the camera.

Image: Casey Anderson

Expedition Grizzly,For about a year, Casey Anderson has been observing and studying grizzly bears at Yellowstone National Park.

Image: Casey and Brutus

Expedition Grizzly,Casey Anderson has raised and taken care of Brutus since he was five months old.

Image: Case on talus slope

Expedition Grizzly,Casey Anderson stands on talus slope near a moth site. The Army Cutworth Moth is a valuable source of protein for grizzly bears.

National Geographic Channel

800-pound grizzly bear Brutus is the curious best friend to renowned naturalist Casey Anderson, who has raised him since birth. Together, they've set out on a yearlong mission to chronicle the lives of Yellowstone's vulnerable grizzly bears.

© National Geographic Channel 2009