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  • Geoff York, USGS biologist, and Katrina Knott, research assistant, collect data from a polar bear (Ursus maritimus) on the Beaufort Sea ice. Kaktovik, Alaska
    D123694.jpg
  • Steve Amstrup and Geoff York, USGS biologists, taking field data from an immobilized large male polar bear (Ursus maritimus). Kaktovik, Alaska
    D123987.jpg
  • Geoff York, USGS biologist, organizing field gear in the garage of the USGS field research station, with polar bear radio collars sitting on the counter in the foreground. Kaktovik, Alaska
    D123846.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 blood from an immobilized large male polar bear.
    D123997.jpg
  • Geoff York, USGS biologist, and his assistant take weight measurements of a captured polar bear on the pack ice of the Beaufort Sea.
    D124412.jpg
  • Geoff York, USGS biologist, prepares a polar bear (Ursus maritimus) darted from the air for data collection. Kaktovik, Alaska
    D123631.jpg
  • Geoff York, a USGS biologist and Katrina Knott, research assistant, collecting data from a polar bear (Ursus maritimus) on the Beaufort Sea ice. Kaktovik, Alaska.
    D123712.jpg
  • Geoff York a USGS biologist, prepares a radio collar while Katrina Knott, research assistant, painting an ID number on the back of a polar bear. The ID number is to make it easy to see from the air that the bear was captured already. Kaktovik, Alaska
    D123739.jpg
  • Geoff York, a USGS biologist, and Katrina Knott, research assistant, collecting data from a polar bear on the Beaufort Sea ice. They use a block and tackle to take weight measurments. Kaktovik, Alaska
    D123732.jpg
  • Steve Amstrup and Geoff York, USGS biologists, taking blood from an immobilized large male polar bear.
    D123995.jpg
  • Steve Amstrup and Geoff York, USGS biologists, taking field data from an immobilized large male polar bear.
    D123977.jpg
  • Geoff York, USGS biologist, prepares a radio collar while Katrina Knott, research assistant, paints an ID number on the back of a polar bear. The ID number is to make it easy to see from the air that the bear was captured already.
    D123748.jpg
  • Steve Amstrup and Geoff York, USGS biologists, taking a biopsy from an immobilized large male polar bear.
    D123949.jpg
  • Geoff York, USGS biologist, collecting data from a polar bear on the Beaufort Sea ice.
    D123716.jpg
  • Geoff York, USGS biologist, collecting data from a polar bear (Ursus maritimus)  on the Beaufort Sea ice. This female bear will receive a radio collar for future tracking.  Kaktovik, Alaska
    D123697.jpg
  • Geoff York, USGS biologist, and Katrina Knott, research assistant, prepare a polar bear to start doing their research.
    D123636.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
  • Geoff York, USGS biologist and assistant Karen Rode take weight measurements of a captured polar bear (Ursus maritimus) on the pack ice of the Beaufort Sea. Kaktovik, Alaska.
    D124398.jpg
  • Geoff York ,a USGS biologist,  finishes up his field work on a sedated polar bear (Ursus maritimus) in the foreground as a second bear in the background, darted earlier wakes and gets to it's feet, still groggy from the tranquilizer. Kaktovik, Alaska.
    D123799.jpg
  • Geoff York a USGS biologist and Karyn Rode, a research assistant, collecting data from a polar bear (Ursus maritimus) on the Beaufort Sea ice. Kaktovik, Alaska.
    D124441.jpg
  • Geoff York, a USGS biologist and Karyn Rode, a research assistant, collecting data from a polar bear (Ursus maritimus) on the Beaufort Sea ice. Kaktovik, Alaska.
    D124356.jpg
  • Geoff York, a USGS biologist and Karyn Rhode, a research assistant, collecting data from a polar bear (Ursus maritimus) on the Beaufort Sea ice. Kaktovik, Alaska.
    D124352.jpg
  • Geoff York, USGS biologist, checks the data base field book that details polar bear captures since 1967 of the Beaufort Sea region. Kaktovik, Alaska.
    D124415.jpg
  • Geoff York, USGS biologist takes weight measurements of a polar bear (Ursus maritimus) on the ice pack of the Beaufort Sea. Kaktovik, Alaska.
    D124409.jpg
  • Geoff York takes steady aim as he prepares to dart a polar bear, from a helicopter, with a tranquilizing dart on the Beaufort Sea ice pack. Kaktovik, Alaska.
    D124387.jpg
  • Geoff York, USGS biologist, prepares a dart to be used to tranquilize a polar bear. Kaktovik, Alaska.
    D124378.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, using a block and tackle device to take the weight of a large male polar bear (Ursus maritimus).  He was 982 lbs. Kaktovik, Alaska.
    D123964.jpg
  • Steve Amstrup and Geoff York, USGS biologists, using a block and tackle device to take the weight of a large male polar bear (Ursus maritimus).  He was 982 lbs. Kaktovik, Alaska.
    D123959.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 and Geoff York, USGS biologists, taking a biopsy from an immobilized large male, polar bear (Ursus maritimus). Kaktovik, Alaska.
    D123942.jpg
  • Steve Amstrup and Geoff York, USGS biologists, taking field data from an immobilized large male polar bear (Ursus maritimus). Kaktovik, Alaska..
    D123940.jpg
  • Geoff York, USGS biologist organizing field gear in the garage of the field research station in Kaktovik, Alaska.
    D123823.jpg
  • Geoff York, USGS biologist organizing field gear in the garage of the field research station in Kaktovik, Alaska.
    D123820.jpg
  • Geoff York preparing for field work at the USGS field station in Kaktovik, Alaska.
    D123817.jpg
  • Geoff York, a USGS biologist and Katrina Knott, research assistant,  taking data from a sedated polar bear (Ursus maritimus) in the foreground while another bear sedated earlier slowly get to its feet in the background. Kaktovik, Alaska.
    D123795.jpg
  • Geoff York, a USGS biologist and Katrina Knott, research assistant, taking measurements of a sedated polar bear (Ursus maritimus) on the Beaufort sea ice. Kaktovik, Alaska.
    D123793.jpg
  • Geoff York, a USGS biologist  taking measurements of a polar bear (Ursus maritimus) on the Beaufort Sea ice. Kaktovik, Alaska.
    D123789.jpg
  • Geoff York, a USGS biologist  taking measurements of a polar bear (Ursus maritimus) on the Beaufort Sea ice. Kaktovik, Alaska.
    D123781.jpg
  • A female polar bear (Ursus maritimus) gets to her feet, still groggy from the tranquilizing drug used to immobilize her for field data collection by USGS biologist Geoff York. A number has been painted on her back for easy identification from the air that she's already been captured this season. Kaktovik, Alaska.
    D123594.jpg
  • Geoff York, a USGS biologist and Katrina Knott, research assistant, taking measurements of a polar bear (Ursus maritimus) they've darted on the Beaufort Sea pack ice. Kaktovik, Alaska.
    D123750.jpg
  • Geoff York, a USGS biologist, collecting data from a polar bear (Ursus maritimus) on the Beaufort Sea ice. Using a block and tackle to take weight measurments.  Kaktovik, Alaska.
    D123726.jpg
  • Geoff York, a USGS biologist and Katrina Knott, a research assistant, collecting data from a polar bear (Ursus maritimus) on the Beaufort Sea ice. Kaktovik, Alaska.
    D123723.jpg
  • Geoff York, a USGS biologist and Katrina Knott, a research assistant, collecting data from a polar bear (Ursus maritimus) on the Beaufort Sea ice. Kaktovik, Alaska.
    D123721.jpg
  • Geoff York a USGS biologist  collecting data from a polar bear (Ursus maritimus) on the Beaufort Sea ice. Kaktovik, Alaska.
    D123711.jpg
  • Geoff York, USGS biologist and Katrina Knott, research assistant, prepare a polar bear (Ursus maritimus) to start doing their research.  This female bear will receive a radio collar for future tracking.  Kaktovik, Alaska.
    D123700.jpg
  • Geoff York ,a USGS biologist, collecting data from a polar bear  (Ursus maritimus) on the Beaufort Sea ice. Kaktovik, Alaska.
    D123692.jpg
  • Geoff York ,a USGS biologist, collecting data from a polar bear  (Ursus maritimus) on the Beaufort Sea ice. Kaktovik, Alaska.
    D123688.jpg
  • Geoff York, USGS biologist and Katrina Knott, research assistant, prepare a polar bear (Ursus maritimus) to start doing their research. Kaktovik, Alaska.
    D123664.jpg
  • Geoff York, USGS biologist and Katrina Knott, research assistant, prepare a polar bear (Ursus maritimus) to start doing their research. Kaktovik, Alaska.
    D123661.jpg
  • Geoff York, USGS biologist prepares a polar bears lip for tattooing with an identifying number, The tattoo is a way to scientifically ID the particular animal for future reference. Kaktovik, Alaska.
    D123536.jpg
  • Geoff York, biologist for the USGS,  prepares a male polar bear to extract a tooth used to  age the animal. Kaktovik, Alaska.
    D123522.jpg
  • Geoff York, biologist for USGS, prepares a polar bear to start doing research. Kaktovik, Alaska.
    D123517.jpg
  • Geoff York a USGS biologist and Katrina Knott, research assistant,  prepare a polar bear to start doing their research. Kaktovik, Alaska.
    D123506.jpg
  • Geoff York, USGS biologist, checks the ear tag of a polar bear (Ursus maritimus) darted from the air for data collection. Kaktovik, Alaska.
    D123633.jpg
  • Geoff York, a USGS biologist,  prepares a polar bear (Ursus maritimus) to start doing their research. Kaktovik, Alaska.
    D123670.jpg
  • Geoff York, a USGS biologist, prepares a male polar bear (Ursus maritimus) to extract a tooth for aging the animal. To age a polar bear properly it's necessary to remove one of the vestigial pre-molars, a tooth just behind the lower canines. It's thought that these teeth are not used a great deal and are unnecessary for survival. Kaktovik, Alaska.
    D123654.jpg
  • Geoff York, biologist for the USGS,  prepares a male polar bear to extract a tooth. The tooth is used to determine the age of the animal. Kaktovik, Alaska
    D123525.jpg
  • A female polar bear gets to her feet, still groggy from the tranquilizing drug used to immobilize her for field data collection by USGS biologist Geoff York.
    D123579.jpg
  • Geoff York, USGS biologist, takes a blood sample of a darted polar bear. Kaktovik, Alaska
    D123567.jpg
  • Geoff York, USGS biologist, checks the data base field book that details polar bear captures since 1967 of the Beaufort Sea region. Kaktovik, Alaska.
    D124418.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 and Geoff York, USGS biologists, using a block and tackle device to take the weight of a large male polar bear (Ursus maritimus).  He was 982 lbs. Kaktovik, Alaska.
    D123956.jpg
  • Steve Amstrup and Geoff York, USGS biologists, taking field data from an immobilized large male polar bear (Ursus maritimus). Kaktovik, Alaska.
    D123928.jpg
  • Geoff York, a USGS biologist and Katrina Knott, research assistant,  taking data from a sedated polar bear (Ursus maritimus) in the foreground while another bear sedated earlier slowly get to its feet in the background. Kaktovik, Alaska.
    D123797.jpg
  • Geoff York, a USGS biologist uses a portable block and tackle device to take weight measurements of a polar bear (Ursus maritimus) on the Beaufort Sea ice. Kaktovik, Alaska.
    D123768.jpg
  • Geoff York, a USGS biologist and Katrina Knott, research assistant, taking measurements of a polar bear (Ursus maritimus) they've darted on the Beaufort Sea pack ice. Kaktovik, Alaska.
    D123751.jpg
  • Geoff York ,a USGS biologist, collecting data from a polar bear  (Ursus maritimus) on the Beaufort Sea ice. Kaktovik, Alaska.
    D123686.jpg
  • Geoff York ,a USGS biologist, collecting data from a polar bear  (Ursus maritimus) on the Beaufort Sea ice. Kaktovik, Alaska.
    D123682.jpg
  • Geoff York, a USGS biologist,  prepares a polar bear (Ursus maritimus) to start doing their research. Kaktovik, Alaska.
    D123668.jpg
  • Geoff York, USGS biologist prepares a polar bears lip for tattooing with an identifying number, The tattoo is a way to scientifically ID the particular animal for future reference. Kaktovik, Alaska.
    D123537.jpg
  • Two polar bears are down, having been darted from the air. Geoff York and Katrina Knott prepare the animals to start doing their research. Kaktovik, Alaska.
    D123630.jpg
  • Geoff York, a USGS biologist  collecting data from a polar bear (Ursus maritimus) on the Beaufort Sea ice. Kaktovik, Alaska.
    D123715.jpg
  • Geoff York a USGS biologist prepares a polar bear (Ursus maritimus) to start doing his research. Kaktovik, Alaska.
    D123681.jpg

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