Jeff Foott / Morning Glory Pool, Upper Geyser Basin, Yellowstone National Park, Wyoming
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Jeff Vanuga / Old Faithful Geyser erupting at -30 Celsius in winter. Upper Geyser Basin, Yellowstone National Park, Wyoming, USA, January 2015.
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Jeff Vanuga / Bison (Bison bison) in deep snow in the Upper Geyser Basin, Yellowstone National Park, Wyoming, USA, January 2008
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Jeff Vanuga / Bull Bison (Bison bison) warming himself in the steam from the Firehole River, Upper Geyser Basin, Yellowstone National Park, Wyoming, USA, January
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Jim Brandenburg / Morning Glory pool in Upper Geyser Basin, Yellowstone National Park, Wyoming
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Nick Garbutt / RF - American bison (Bison bison) male standing near Punch Bowl thermal pool, green algae in foreground. Yellowstone National Park, USA. (This image may be licensed either as rights managed or royalty...
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John Shaw / South Scalloped Spring with thermophilic algae, on the bank of the Firehole River, Upper Geyser Basin, Yellowstone National Park, Wyoming, USA. January.
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Jeff Foott / Hot spring, Doublet Pool, Upper Geyser Basin, Yellowstone National Park, Wyoming
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Jeff Foott / Hot spring, Doublet Pool, Upper Geyser Basin, Yellowstone National Park, Wyoming
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Jeff Foott / Hot spring, Doublet Pool, Upper Geyser Basin, Yellowstone National Park, Wyoming
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Jeff Foott / Hot spring, Doublet Pool, Upper Geyser Basin, Yellowstone National Park, Wyoming
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Daniel J. Cox / Steaming fumaroles, Castle Geyser, Upper Geyser Basin, Yellowstone National Park, Wyoming
