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Clockwise from top left: Tree snail (Liguus fasciatus) and bromeliad, Big Cypress National Preserve, Florida. Gray fox (Urocyon cinereoargenteus), Big Bend National Park, Texas. Alligator (Alligator mississippiensis), Everglades National Park, Florida. Harlequin ducks (Histrionicus histrionicus), Yellowstone National Park, Wyoming.
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