Adult brown bear (Ursus arctos) scratching its back on tree, Brooks River, Katmai National Park near Bristol Bay, Alaska, United States of America

Adult brown bear (Ursus arctos) scratching its back on tree, Brooks River, Katmai National Park, near Bristol Bay, Alaska, United States of America

Young brown bear (Ursus arctos) scratching its back on the gravel at the Brooks River, Katmai National Park, Alaska, United States of America

Adult brown bear (Ursus arctos) scratching its back on a tree at the Brooks River, Katmai National Park, Alaska, United States of America

Adult brown bear (Ursus arctos) scratching its back on a tree at the Brooks River in Katmai National Park near Bristol Bay, Alaska, USA. Pacific Ocean

Young adult brown bear (Ursus arctos) scratching its back on the gravel at the Brooks River in Katmai National Park near Bristol Bay, Alaska, USA. Pacific Ocean

Adult male Polar Bear, Ursus maritimus, scratching his back/sleeping on ice near Churchill, northern Manitoba, Hudson Bay, Canada

Adult male Polar Bear, Ursus maritimus, shaking like a dog after scratching his back on a willow tree near Churchill, northern Manitoba, Hudson Bay, Canada

Adult brown bear (Ursus arctos) scratching its back on a tree at the Brooks River in Katmai National Park near Bristol Bay, Alaska, USA. Pacific Ocean

Allergic dermatitis. The skin of the girl is amazed by dermatitis.

A Scarred Brown Bear Stands To Scratch His Back Alongside Brooks River, Southwest Alaska, Summer

A Scarred Brown Bear Stands To Scratch His Back Along Brooks River, Katmai National Park, Southwest Alaska

A Scarred Brown Bear Stands To Scratch His Back Along Brooks River, Katmai National Park, Southwest Alaska

Man in sports clothing back lit by sun