Large polar bear
Images
Browse images from a wide range of science topics covered by USGS. All items in this gallery are considered public domain unless otherwise noted.
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Black-capped Chickadee with a long down-curved elongated top beak
Black-capped Chickadee with a long down-curved elongated top beakBlack-capped Chickadee with a long down-curved elongated top beak. Avian keratin disorder (AKD) is a disease characterized by debilitating beak overgrowth and other abnormalities of keratinized tissues. Affected birds have difficulty feeding and preening and may suffer high rates of mortality.
Black-capped Chickadee with a long down-curved elongated top beak
Black-capped Chickadee with a long down-curved elongated top beakBlack-capped Chickadee with a long down-curved elongated top beak. Avian keratin disorder (AKD) is a disease characterized by debilitating beak overgrowth and other abnormalities of keratinized tissues. Affected birds have difficulty feeding and preening and may suffer high rates of mortality.
Spectacled eiders wintering in open areas of the pack ice
Spectacled eiders wintering in open areas of the pack iceSpectacled eiders wintering in open areas of the pack ice in the northern Bering Sea, near St. Lawrence Island.
Spectacled eiders wintering in open areas of the pack ice
Spectacled eiders wintering in open areas of the pack iceSpectacled eiders wintering in open areas of the pack ice in the northern Bering Sea, near St. Lawrence Island.
A section of open water on the Nome River, Alaska
Using remote sensing through the ice to determine how much water was in the Nome River in the winter. Some spots were open to the air.
Using remote sensing through the ice to determine how much water was in the Nome River in the winter. Some spots were open to the air.
Ice sampling on the Nome River, Alaska
Using remote sensing through the ice to determine how much water was in the Nome River in the winter.
Using remote sensing through the ice to determine how much water was in the Nome River in the winter.
Drilling a hole in the ice on the Nome River, Alaska
Drilling a hole in the ice on the Nome River, AlaskaUsing remote sensing through the ice to determine how much water was in the Nome River in the winter.
Drilling a hole in the ice on the Nome River, Alaska
Drilling a hole in the ice on the Nome River, AlaskaUsing remote sensing through the ice to determine how much water was in the Nome River in the winter.
Black-capped Chickadee with an elongated and decurved maxilla
Black-capped Chickadee with an elongated and decurved maxillaBlack-capped Chickadee with an elongated and decurved maxilla.
Black-capped Chickadee with an elongated and decurved maxilla
Black-capped Chickadee with an elongated and decurved maxillaBlack-capped Chickadee with an elongated and decurved maxilla.
Tanana River winter water sampling
Water sampling on the Tanana River. Notice the poles of the piezometers installed in the river. This project was to see chum salmon spawning habitat in the winter.
Water sampling on the Tanana River. Notice the poles of the piezometers installed in the river. This project was to see chum salmon spawning habitat in the winter.
Tanana River winter water sampling
Biologist standing in the Tanana River sampling the open water. This project was to see chum salmon spawning habitat in the winter.
Biologist standing in the Tanana River sampling the open water. This project was to see chum salmon spawning habitat in the winter.
Biologists looking over the Tanana River in November, 2008
Biologists looking over the Tanana River in November, 2008Biologists looking from a bluff over the Tanana River in November 2008. This project was to see chum salmon spawning habitat in the winter.
Biologists looking over the Tanana River in November, 2008
Biologists looking over the Tanana River in November, 2008Biologists looking from a bluff over the Tanana River in November 2008. This project was to see chum salmon spawning habitat in the winter.
Tanana River salmon eggs in the gravel in November 2008
Tanana River salmon eggs in the gravel in November 2008Chum salmon eggs in the gravel in the Tanana River. This project was to see chum salmon spawning habitat in the winter.
Tanana River salmon eggs in the gravel in November 2008
Tanana River salmon eggs in the gravel in November 2008Chum salmon eggs in the gravel in the Tanana River. This project was to see chum salmon spawning habitat in the winter.
Biologist reading water sampling meter during winter Tanana River work
Biologist reading water sampling meter during winter Tanana River workBiologist reading water meter in the Tanana River in November, 2008. This project was to see chum salmon spawning habitat in the winter.
Biologist reading water sampling meter during winter Tanana River work
Biologist reading water sampling meter during winter Tanana River workBiologist reading water meter in the Tanana River in November, 2008. This project was to see chum salmon spawning habitat in the winter.
Biologist getting ready for Tanana River sampling in November, 2008
Biologist getting ready for Tanana River sampling in November, 2008Biologist standing next to the shore getting ready to sample water in the Tanana River. This project was to see chum salmon spawning habitat in the winter.
Biologist getting ready for Tanana River sampling in November, 2008
Biologist getting ready for Tanana River sampling in November, 2008Biologist standing next to the shore getting ready to sample water in the Tanana River. This project was to see chum salmon spawning habitat in the winter.
Helicopter used for transportation on Tanana River winter sampling
Helicopter used for transportation on Tanana River winter samplingA helicopter used to transport personnel to the Tanana River to winter sample chum salmon spawning habitat.
Helicopter used for transportation on Tanana River winter sampling
Helicopter used for transportation on Tanana River winter samplingA helicopter used to transport personnel to the Tanana River to winter sample chum salmon spawning habitat.
The northern lights over the Selawik River, Alaska
The northern lights over the Selawik River, AlaskaThe northern lights over the Selawik River, Alaska
The northern lights over the Selawik River, Alaska
The northern lights over the Selawik River, AlaskaThe northern lights over the Selawik River, Alaska
Sheefish eggs from the Selawik River, Alaska
Sheefish eggs in a vial from the Selawik River, Alaska
Sheefish eggs in a vial from the Selawik River, Alaska
A close up of a moose on the Selawik River, Alaska
A close up of a moose on the Selawik River, AlaskaA moose on the shore of the Selawik River. This moose was present during the Sheefish sediment impact study field work.
A close up of a moose on the Selawik River, Alaska
A close up of a moose on the Selawik River, AlaskaA moose on the shore of the Selawik River. This moose was present during the Sheefish sediment impact study field work.
The Selawik River, Alaska
Scenic of the Selawik River
Scenic of the Selawik River
Clipping a sheefish fin in the Selawik River
Biologists clip the tip of one of the ventral fins of a sheefish that is in a cradle in the Selawik River, Alaska. This study was collecting genetic samples to help find impacts of fine sediment on sheefish. The results were no impacts due to low amounts of sediments present.
Biologists clip the tip of one of the ventral fins of a sheefish that is in a cradle in the Selawik River, Alaska. This study was collecting genetic samples to help find impacts of fine sediment on sheefish. The results were no impacts due to low amounts of sediments present.
Biologist recording data on Black-capped Chickadee
Biologist recording data on Black-capped ChickadeeJohn Terenzi recording data on Black-capped Chickadee.
Biologist recording data on Black-capped Chickadee
Biologist recording data on Black-capped ChickadeeJohn Terenzi recording data on Black-capped Chickadee.
Caribou crossing the Selawik River, Alaska
Caribou crossing the Selawik River, Alaska