FILE - In this April 30, 2001 file photo provided by Brendan 

FILE - In this April 30, 2001 file photo provided by Brendan P. Kelly, a ringed seal looks out of a snow cave on the ice off of Barrow, Alaska. Ringed seals, the main prey of polar bears, and bearded seals in the Arctic Ocean will be listed as threatened under the Endangered Species Act, the National Oceanic and Atmospheric Administration announced, Friday, Dec. 21, 2012. (AP Photo/Brendan P. Kelly, File)
Associated Press
FILE - In this April 30, 2001 file photo provided by Brendan P. Kelly, a ringed seal looks out of a snow cave on the ice off of Barrow, Alaska. Ringed seals, the main prey of polar bears, and bearded seals in the Arctic Ocean will be listed as threatened under the Endangered Species Act, the National Oceanic and Atmospheric Administration announced, Friday, Dec. 21, 2012. (AP Photo/Brendan P. Kelly, File)
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