A plains bison in winter at Yellowstone National Park. A bison's hump is useful as a snowplow in winter when the animal swings its head from side to side to brush aside the snow to reach food underneath. The hump is composed of muscles supported by long vertebrae.
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Bison in Winter
A plains bison in winter at Yellowstone National Park. A bison's hump is useful as a snowplow in winter when the animal swings its head from side to side to brush aside the snow to reach food underneath. The hump is composed of muscles supported by long vertebrae.
Scientist Taking Water Samples
Todd Preston, USGS contract scientist, collecting a surface-water sample from a Prairie Pothole wetland.
Todd Preston, USGS contract scientist, collecting a surface-water sample from a Prairie Pothole wetland.
Two Cladonia Lichen Species Among Blueberry Plants
Two Cladonia lichen species, C. stellaris and C. rangiferina are pictured here among some blueberry plants in Newfoundland. Lichens -- which are often mistaken for moss -- are unusual plant-like organisms that are actually symbioses of fungi, algae and bacteria living together.
Two Cladonia lichen species, C. stellaris and C. rangiferina are pictured here among some blueberry plants in Newfoundland. Lichens -- which are often mistaken for moss -- are unusual plant-like organisms that are actually symbioses of fungi, algae and bacteria living together.
Louisiana Black Bear and Cubs
A threatened Louisiana black bear and her cubs up in a tree.
A threatened Louisiana black bear and her cubs up in a tree.
Prairie Pothole Region
Prairie Pothole Region landscape showing high wetland density.
Prairie Pothole Region landscape showing high wetland density.
Flat Cays, U.S. Virgin Islands Coral Reef
Shallow coral reefs in the U.S. Virgin Islands are in jeopardy due to climate warming and ocean acidification.
Shallow coral reefs in the U.S. Virgin Islands are in jeopardy due to climate warming and ocean acidification.
Geyser Valley, Olympic National Park
Picture of Geyser Valley in Olympic National Park in Northwest Washington.
Picture of Geyser Valley in Olympic National Park in Northwest Washington.
Bird Migration Card - 1937
Image scan of a historical bird migration card.
Image scan of a historical bird migration card.
Bird Migration Card - 1933
Image scan of a historical bird migration card.
Image scan of a historical bird migration card.
Bird Migration Card - 1922
Image scan of a historical bird migration card.
Image scan of a historical bird migration card.
Historical Bird Migration Card
Image scan of a historical bird migration card (1904).
Image scan of a historical bird migration card (1904).
Historic photo by Nims on Stanton's Colorado River survey trip taken at Lees Ferry
This image was taken in 1889 by Nims on Stanton's Colorado River survey trip.
This image was taken in 1889 by Nims on Stanton's Colorado River survey trip.