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  • A polar bear (Ursus maritimus) lies spread out over the ice of the Beaufort Sea. He's immobilized from a tranquilizer and on the verge of waking after USGS biologists have just performed their field tests on him. Kaktovik, Alaska
    D123807.jpg
  • Dr. Steve Amstrup, USGS biologist, and field assistant Karyn Rode taking field data from an immobilized large male polar bear.
    D124554.jpg
  • Steve Amstrup and Geoff York, USGS biologists, taking blood from an immobilized large male polar bear.
    D123997.jpg
  • Steve Amstrup and Geoff York, USGS biologists, taking field data from a large, immobilized male polar bear (Ursus maritimus). Kaktovik, Alaska
    D123954.jpg
  • Steve Amstrup and Geoff York, USGS biologists, taking field data from an immobilized large male polar bear.
    D123977.jpg
  • Dr. Steven Amstrup and Susie Miller collect the Bioelectric Impedance Analysis (BIA) that quantifies fat reserves of a recently immobilized polar bear on the Beaufort Sea, Alaska.
    D170791.jpg
  • Dr. Steven Amstrup measures the length of a recently immobilized polar bear. A spot of red blood on the animal's fur shows the entrance point of the dart. Beaufort Sea, Alaska
    D170673.jpg
  • Steve Amstrup and Geoff York, USGS biologists, taking a biopsy from an immobilized large male polar bear.
    D123949.jpg
  • Steve Amstrup , USGS biologist, taking field data from an immobilized large male polar bear (Ursus maritimus). Kaktovik, Alaska.
    D123939.jpg
  • Dr. Steve Amstrup, USGS biologist, and Doc Gohmert, chopper pilot, prepare to land near an immobilized polar bear (Ursus maritimus). Beaufort Sea ice pack, Kaktovik, Alaska
    D125960.jpg
  • Steve Amstrup and Geoff York, USGS biologists, taking blood from an immobilized large male polar bear.
    D123995.jpg
  • Steve Amstrup, lead USGS biologist, paints a number on the back of an immobilized large male polar bear that was darted for research purposes. Kaktovik, Alaska
    D124009.jpg
  • Pam Coy stands in a bear den and assists in removing an immobilized black bear (Ursus americanus) for reserach data. Minnesota
    00471-12604.jpg
  • Steve Amstrup, lead USGS biologist, taking field data from an immobilized large male polar bear. Kaktovik, Alaska
    D123981.jpg
  • A female polar bear (Ursus maritimus) dazed and weak from an immobilizing drug she received from Dr. Steve Amstrup, USGS biologist. Beaufrot Sea ice pack, Kaktovik, Alaska
    D125577.jpg
  • A large male polar bear, sedated from an immobilizing drug, runs from the capture helicopter on the Beaufort Sea ice pack.
    D125308.jpg
  • A large male polar bear sedated with immobilizing drugs by Dr. Steve Amstrup. Beaufort Sea, Alaska
    D125317.jpg
  • Dr. Steve Amstrup working with a female polar bear that is coming out of an immobilizing drug on the Beaufort Sea ice pack.
    D125193.jpg
  • A large male polar bear, sedated with immobilizing drugs, watches Dr. Steve Amstrup exit from the capture helicopter. Beaufort Sea pack ice, Kaktovik, Alaska
    D125313.jpg
  • Dr. Steven Amstrup collects data from a polar bear on the Beaufort Sea, Alaska.
    D171497-P.jpg
  • Dr. Steve Amstrup with a tranqulized polar bear (Ursus maritimus) on the ice pack of the Beaufort Sea. Kaktovik, Alaska
    D124625-P.jpg
  • Geoff York, USGS biologist, prepares a polar bear (Ursus maritimus) darted from the air for data collection. Kaktovik, Alaska
    D123631.jpg
  • Merav Ben-David from the University of Wyoming  and project leader of the Polar Sea Icebreaker polar bear research cruise, passes by her two colleagues John Whiteman and Hank Harlow as they collect breath from a polar bear for a breath analysis experiment. Arctic Ocean
    D228737.jpg
  • John Whiteman and Hank Harlow, both from the University of Wyoming, collect breath from a polar bear for a breath analysis experiment. Arctic Ocean
    D228724.jpg
  • USGS biologist Dr. Steve Amstrup and assistant Karyn Rode attempt to lift a small 365-pound female polar bear on the Beaufort Sea ice pack.
    D125184-P.jpg
  • Dr. Steven Amstrup with a polar bear on the Beaufort Sea, Alaska.
    D170908-P.jpg
  • A helicopter with biologists from the USGS approach a polar bear they recently shot with an immobilization drug. He'll soon be down so they can perform their field research and data collection.
    D124156.jpg
  • Steve Amstrup, lead polar bear biologist for the USGS, prepares a dart that will be filled with telezol, an imobilizing drug. Kaktovik, Alaska
    D123862.jpg
  • Steve Amstrup, lead polar bear biologist for the USGS, prepares a dart that will be filled with Telazol, an imobilizing drug. Kaktovik, Alaska
    D123857.jpg
  • Dr Steven Amstrup approaches an immobilized female polar bear with cub. Beaufort Sea, Alaska
    D169971.jpg
  • Dr. Steve Amstrup , USGS biologist, and Karyn Rode, field assitant, taking field data from an immobilized large male polar bear (Ursus maritimus). Kaktovik, Alaska.
    D124519.jpg
  • A large male polar bear (Ursus maritimus) lies immobilized on ice of the Beaufort Sea. Kaktovik, Alaska.
    D123950.jpg
  • Polar Bear (Ursus maritimus) an immobilized female with her cub on the Beaufort Sea, Alaska.
    D169966.jpg
  • Black Bear, (Ursus americanus) Minnesota, Dave Garshelis draws a blood sample from immobilized bear for research data.
    00471-12906.jpg
  • Dr Steven Amstrup collects a fat biopsy sample from a recently immobilized polar bear on the Beaufort Sea, Alaska. Steven
    D170758.jpg
  • A polar bear cub stained with green die from a lip tattoo cuddles up to it's immobilized mother. Beaufort Sea, Alaska.
    D170217.jpg
  • Steve Amstrup , lead USGS biologist, taking field data from an immobilized large male polar bear.
    D125255.jpg
  • Dr Steven Amstrup and Susie Miller  collect data from a recently immobilized polar bear on the Beaufort Sea, Alaska. Steven
    D170678.jpg
  • A polar bear (Ursus maritimus) lies spread out over the ice of the Beaufort sea. He's immobilized from a tranquilizer and on the verge of waking after USGS biologists have performed their field tests on him. Kaktovik, Alaska.
    D123810.jpg
  • Steve Amstrup , lead USGS biologist, taking field data from an immobilized large male polar bear.
    D125240.jpg
  • Steve Amstrup and Geoff York, USGS biologists, taking field data from an immobilized large male polar bear (Ursus maritimus). Kaktovik, Alaska
    D123987.jpg
  • Polar Bear (Ursus maritimus) a large male lies immobilized on the ice of the Beaufort Sea. Alaska.
    D171305.jpg
  • A large male polar bear immobilized on the ice of Beaufort Sea.
    D170927.jpg
  • Dr Steven Amstrup, doing a test on an immobilized polar bear called a Bioelectric Impedance Analysis (BIA) that helps determine the fat reserves of the animal.Beaufort Sea, Alaska. The bear is beginning to wake.
    D170865.jpg
  • Dr Steven Amstrup and Susie Miller  collect data from a recently immobilized polar bear on the Beaufort Sea, Alaska. Steven
    D170699.jpg
  • Dr Steven Amstrup approaches an immobilized polar bear on the Beaufort Sea, Alaska. Steven
    D170664.jpg
  • A large male polar bear (Ursus maritimus) lies immobilized on the ice pack of the Beaufort Sea. Kaktovik, Alaska.
    D124579.jpg
  • Steve Amstrup , lead USGS biologist, paints a number on the back of an immobilized large male polar bear (Ursus maritimus) that was darted for research purposes. Kaktovik, Alaska.
    D124005.jpg
  • Steve Amstrup and Geoff York, USGS biologists, taking field data from an immobilized large male polar bear (Ursus maritimus). Kaktovik, Alaska..
    D123970.jpg
  • Steve Amstrup , lead USGS biologist, and assistant Karyn Rode, taking field data from an immobilized large, male, polar bear.
    D125268.jpg
  • Steve Amstrup , lead USGS biologist, and assistant Karyn Rode, taking field data from an immobilized large, male, polar bear.
    D125244.jpg
  • A large male polar bear (Ursus maritimus) lies immobilized on the ice pack of the Beaufort Sea. Kaktovik, Alaska.
    D124589.jpg
  • Steve Amstrup , lead USGS biologist, and assistant Karyn Rode, taking field data from an immobilized large, male, polar bear.
    D125259.jpg
  • Dr amstrup check a recently immobilized Alaska.
    D171584.jpg
  • Dr Steven Amstrup collects data from a recently immobilized polar bear on the Beaufort Sea, Alaska. Steven
    D170717.jpg
  • A large male polar bear (Ursus maritimus) lies immobilized on the ice pack of the Beaufort Sea. Kaktovik, Alaska.
    D124588.jpg
  • Dr. Steve Amstrup , USGS biologist and Karyn Rode, field assitant, taking field data from an immobilized large male polar bear (Ursus maritimus). Kaktovik, Alaska..
    D124575.jpg
  • Steve Amstrup , lead USGS biologist, paints a number on the back of an immobilized large male polar bear (Ursus maritimus) that was darted for research purposes. Kaktovik, Alaska.
    D124007.jpg
  • Steve Amstrup and Geoff York, USGS biologists, taking a biopsy from an immobilized large male, polar bear (Ursus maritimus). Kaktovik, Alaska.
    D123942.jpg
  • Dr Steven Amstrup collects data from a recently immobilized polar bear on the Beaufort Sea, Alaska. Steven
    D170688.jpg
  • Dr. Steve Amstrup , USGS biologist and Karyn Rode, field assitant, taking field data from an immobilized large male polar bear (Ursus maritimus). Kaktovik, Alaska..
    D124546.jpg
  • Steve Amstrup and Geoff York, USGS biologists, taking field data from an immobilized large male polar bear (Ursus maritimus). Kaktovik, Alaska.
    D123928.jpg
  • Dr Steve Amstrup collecting data from an immobilized polar bear. Beaufort Sea, Alaska..
    D171755.jpg
  • A large male polar bear immobilized on the ice of Beaufort Sea.
    D171582.jpg
  • Dr Steven Amstrup, Susie Miller  and chopper pilot Bob Dunbar collect data from a recently immobilized polar bear on the Beaufort Sea, Alaska. The bear is beginning to wake.
    D170849.jpg
  • Dr Steven Amstrup and Susie Miller  collect data from a recently immobilized polar bear on the Beaufort Sea, Alaska. Steven
    D170784.jpg
  • Dr Steven Amstrup collects data from a recently immobilized polar bear on the Beaufort Sea, Alaska. Steven
    D170766.jpg
  • Dr Steven Amstrup prepares to take data from an immobilized polar bear, Beaufort Sea, Alaska.
    D170404.jpg
  • Steve Amstrup , lead USGS biologist, and assistant Karyn Rode, taking field data from an immobilized large, male, polar bear.
    D125285.jpg
  • Dr. Steven Amstrup and assistant Karyn Rode prepare a large male polar bear for scientific data collection they perform out on the ice of the Bering Sea. This large specimen was captured after being immobilized with a dart from a helicopter. This adult male wasn't even over 1,000 pounds, unlike many Dr. Amstrup captured in the 1980s that would tip the scales considerably over that 1,000-pound mark. Alaska
    D125246.jpg
  • A large male polar bear immobilized on the ice of Beaufort Sea.
    D171559.jpg
  • Dr Steven Amstrup collects data from a recently immobilized polar bear on the Beaufort Sea, Alaska. Steven
    D170666.jpg
  • Dr Steven Amstrup and Susie Miller prepare to take data from an immobilized polar bear on the Beaufort Sea, Alaska
    D170406.jpg
  • Dr. Steve Amstrup , USGS biologist and Karyn Rode, field assitant, taking field data from an immobilized large male polar bear (Ursus maritimus). Kaktovik, Alaska..
    D124571.jpg
  • Steve Amstrup and Geoff York, USGS biologists, taking field data from an immobilized large male polar bear (Ursus maritimus). Kaktovik, Alaska.
    D123989.jpg
  • Steve Amstrup and Geoff York, USGS biologists, taking field data from an immobilized large male polar bear (Ursus maritimus). Kaktovik, Alaska..
    D123940.jpg
  • Dr Steven Amstrup, Susie Miller  and chopper pilot Bob Dunbar roll a bear on to a tarp used to collect the Bioelectric Impedance Analysis (BIA) that quantifies fat reserves of a recently immobilized polar bear on the Beaufort Sea, Alaska. Steven
    D170810.jpg
  • Polar Bear (Ursus maritimus) a large male lies immobilized on the ice as Dr. Steven Amstrup and his assistant head for a female that was darted at the same time and is down on the ice. Beaufort Sea, Alaska
    D170397.jpg
  • A polar bear (Ursus maritimus) lies immobilized on the ice pack of the Beaufort Sea framed by calipers used to take it's measurements. Kaktovik, Alaska.
    D124528.jpg
  • Steve Amstrup and Geoff York, USGS biologists, taking a biopsy from an immobilized large male, polar bear (Ursus maritimus). Kaktovik, Alaska.
    D123944.jpg
  • Steve Amstrup , lead USGS biologist, and assistant Karyn Rode, taking field data from an immobilized large, male, polar bear.
    D125261.jpg
  • Steve Amstrup , lead USGS biologist, and assistant Karyn Rode, taking field data from an immobilized large, male, polar bear.
    D125241.jpg
  • Dr Amstrup prepares to attach a GPS satellite tracking collar to an immobilized polar bear on the Beaufort Sea. The collars are placed on females exclusively since the necks of males get too large for them to work properly. The collars are a high tech way to follow these animals far out onto the ice where humans can't go. The bears are tracked by satellites which helps the scientists determine the home range of individual animals and other details about a particular bear's life such as length of time spent resting or hunting in one area.
    D171752.jpg
  • Bob Dunbar helps Dr. Steven amstrup collect data from an immobilized poalr bear, Beaufort Sea, Alaska
    D170937.jpg
  • Dr. Steve Amstrup , USGS biologist and Karyn Rode, field assitant, taking field data from an immobilized large male polar bear (Ursus maritimus). Kaktovik, Alaska..
    D124560.jpg
  • Dr. Steven Amstrup, lead scientist for the US Geological Survey, darts a female polar bear on the Beaufort Sea. Darting the bears from a helicopter can be extremely treacherous. The pilot has to hover over a running animal that is twisting and turning, dodging and ducking, an animal that feels it's running for its life. This bear is hit directly between the shoulders with an immobilizing dart. It takes anywhere from 4-15 minutes for the drug to take effect and immobilize the bear which will be out for 1-2 hours as the scientists process the data.
    D169923.jpg
  • A large male polar bear (Ursus maritimus) losing coordination from the immobilizing drug he was darted with.
    D124176.jpg
  • Dr. Steve Amstrup cuts an immobilizing dart from the hide of a polar bear. Beaufort Sea, Alaska
    D124831.jpg
  • A large male polar bear (Ursus maritimus) having just been darted with an immobilizing drug, stands shaky and ready to go down against the beautiful backdrop of the Beaufort Sea ice. Kaktovik, Alaska.
    D124102.jpg
  • A polar bear cub begins to wake from an immobilizing drug. Dr. Steve Amstrup and assistant work on its mother in the background. The cub's lip has green dye from a tattoo that was applied to the inside of his lips. Scientists will use the tatoo to identify him in the future.
    D170130.jpg
  • Polar bear shot with a dart filled with an immobilizing drug. The bear is showing signs of ataxia. Beaufort Sea, Alaska
    D172180.jpg
  • Dr. Steve Amstrup, USGS biologist, and chopper pilot Doc Gohmert hover over a polar bear (Ursus maritimus) recently darted with immobilizing drugs. Beaufort Sea ice pack, Kaktovik, Alaska
    D125563.jpg
  • A female polar bear dazed and weak from an immobilizing drug she received from Dr. Steve Amstrup, USGS biologist. Beaufort Sea ice pack, Kaktovik, Alaska
    D125614.jpg
  • A female polar bear (Ursus maritimus) darted and weak from an immobilizing drug she received from Dr. Steve Amstrup, USGS biologist. Beaufort Sea, Alaska
    D125585.jpg
  • A female polar bear with a newly painted identifying number on her back and a radio collar around her neck, stands in a groggy disoriented state. She has just emerged from an immobilizing drug used by USGS biologist Steven Amstrup. The number is used to identify the bear from the air so she is not captured again that same year. The number wears off after a couple of weeks.
    D123598.jpg
  • Polar Bear (Ursus maritimus) shot with a dart filled with a drug used to immobilize it by Dr. Steve Amstrup. Bear showing signs of ataxia. Beaufort Sea, Alaska(Urus maritimus)
    D172185.jpg
  • Polar Bear (Ursus maritimus) shot with a dart filled with a drug used to immobilize it by Dr. Steve Amstrup. Bear showing signs of ataxia. Beaufort Sea, Alaska(Urus maritimus)
    D172181.jpg
  • Dr Steven Amstrup leans out of a flying helicopter to shoot an immobilizing drug into a polar bear. Beaufort Sea, Alaska.
    D172014.jpg
  • Dr Steven Amstrup positions a block of ice beneath a large male polar bears head for safety as it wakes from the immobilizing drug. Beaufort Sea, Alaska.
    D171545.jpg
  • A polar bear cub begins to wake from the  immobilizing drug, green die from a tattoo stains his muzzle as he nuzzles his still tranquilized mother. Beaufort Sea, Alaska.
    D170170.jpg
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