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Dusty Bison | by Suzanham
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Dusty Bison

Wallowing is a common behavior of bison. A bison wallow is a shallow depression in the soil, either wet or dry. Bison roll in these depressions, covering themselves with mud or dust. Possible explanations suggested for wallowing behavior include grooming behavior associated with moulting, male-male interaction (typically rutting behavior), social behavior for group cohesion, play behavior and relief from skin irritation due to biting insects. (wikipedia)

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Taken on July 23, 2012