Jouan Rius / Black oak (Quercus velutina) in autumn, in Yosemite valley, Yosemite National Park, California, USA, December 2012.
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Doug Wechsler / Eastern grey squirrel (Sciurus carolinensis) black morph foraging on white oak acorns, Chestnut Hill, Philadelphia, Pennsylvania, USA, September.
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Doug Wechsler / Eastern grey squirrel (Sciurus carolinensis) black morph foraging on white oak acorns, Chestnut Hill, Philadelphia, Pennsylvania, USA, September.
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Jouan Rius / Black oaks (Quercus velutina) in autumn, Yosemite valley, Yosemite National Park, California, USA, November 2012.
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Jouan Rius / Black oaks (Quercus velutina) in autumn, Yosemite valley, Yosemite National Park, California, USA, November 2012.
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Jouan Rius / Black oak (Quercus velutina) in autumn, Yosemite Valley, Yosemite National Park, California, USA, December 2012.