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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
  • 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, 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
  • 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
  • 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, USGS biologist, and Katrina Knott, research assistant, prepare a polar bear to start doing their research.
    D123636.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
  • Katrina Knott, a research assistant for the USGS takes weight measurements  of a polar bear (Ursus maritimus) on the Beaufort Sea ice. Kaktovik, Alaska.
    D123773.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, 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 and Katrina Knott, research assistant,  prepare a polar bear to start doing their research. Kaktovik, Alaska.
    D123506.jpg
  • Katrina Knott, research assistant,  prepare a polar bear (Ursus maritimus) to start doing their research. Kaktovik, Alaska.
    D123679.jpg
  • Katrina Knott , field research assistant, works on preparing blood samples taken from polar bears by USGS biologists. She's working from her field lab at a US Fish & Wildlife Service station in Kaktovik, Alaska.
    D124221.jpg
  • Katrina Knott , field research assistant, works on preparing blood samples taken from polar bears by USGS biologists. She's working from her field lab at a US Fish & Wildlife Service station in Kaktovik, Alaska.
    D124220.jpg
  • Blood samples from polar bear #20571, captured on the Beaufort Sea, prepared by Katrina Knott will eventually   be sent to Fairbanks, Alaska for further analysis. Kaktovik, Alaska.
    D124214.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 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 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 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, 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
  • Katrina Knott, research assistant for USGS, swabs the inside area between a female polar bears toes. It's thought that female polar bears possibly give off a scent through their feet during estrus. Kaktovik, Alaska.
    D123511.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

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