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  • Denver Holt weighs a snowy owl (Bubo scandiacus) chick on the north slope of Brooks Range, Alaska.
    D178675.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.jpg
  • The polar bear team weighs a female polar bear. Arctic Ocean
    D228752.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
  • 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
  • Dr. Steve Amstrup, USGS biologist, and Daniel Cox use a weight bar to lift and weigh a small, 365-pound female polar bear. Beaufort Sea
    D125192.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
  • Dr Amstrup and crew take the weight of a polar bear on the Beaufort Sea, alaska.
    D169717.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 takes weight measurements of a polar bear (Ursus maritimus) on the ice pack of the Beaufort Sea. Kaktovik, Alaska.
    D124409.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
  • 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, 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
  • Karyn Rode, USGS assistant biologist, using a (BIA) Bio Electical Impedance Analysis device, to check the weight of a small, female, polar bear. Beaufort Sea ice pack.
    D125164.jpg
  • Dr. Steve Amstrup, USGS biologist and assistant, Karyn Rode, using a (BIA) Bio Electical Impedance Analysis device, to check the weight of a small, female, polar bear. Beaufort Sea ice pack.
    D125160.jpg
  • Black Bear, (Ursus americanus) Minnesota, D.W. Kuehn checks weight of small cub taken from winter den for data.
    00471-12607.jpg
  • Shafts of rain covered grass bend from weight. Summer.  Minnesota.
    64723-00110.jpg
  • Dr Amstrup and crew take the weight of a polar bear on the Beaufort Sea, alaska.
    D169712.jpg
  • Dr Amstrup and crew take the weight of a polar bear on the Beaufort Sea, alaska.
    D169708.jpg
  • Dr Amstrup and crew take the weight of a polar bear on the Beaufort Sea, alaska.
    D169700.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
  • 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
  • Dr. Steve Amstrup, USGS biologist and assistant, Karyn Rode, using a (BIA) Bio Electical Impedance Analysis device, to check the weight of a small, female, polar bear. Beaufort Sea ice pack.
    D125158.jpg

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