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A Gray Wolf (Canis lupus) runs from a charging bull Bison (Bison bison) who is defending an injured cow Bison along the banks of Otter Creek in Yellowstone National Park. Captured with a Canon 7D and 500/4.0L IS in aperture priority mode with an exposure bias of + 2/3 at ISO400, f/4.5, and 1/500th of a second. The camera was mounted on a Gitzo 3541 XLS with an Induro GHB2 gimbal head.

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