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During autumn, Black Bears (Ursus americanus) gorge on the abundance of River Hawthorne in Grand Teton National Park, Wyoming, October 2017. As winter approaches both Black and Grizzly Bears enter a state called hyperphagia as they become preoccupied with consuming as much nutrition as possible. "Hyperphagia" is from the Greek words phagia (to eat) and hyper (obsessively) meaning to eat obsessively. Hyperphagia is a biological survival mechanism to ensure that bears enter hibernation with as much fat reserve as possible. The bears that I observed literally consumed berries all day long and I am sure that they were eating all night as well. Canon 5D IV, 100-400mm Mark II, ISO 640, 1/640 second @ f/5.6, image size 4480 x 6720 pixels.
ImageWildlifeautumnberriesblack bearfallgrand teton national parkhawthornhyperphagiajackson holemammal.tongueursus americanuswyoming