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Ringed seals are the primary prey of polar bears. They are the only seals that can live in completely ice-covered waters, using stout claws to dig and maintain breathing holes. They excavate snow caves on sea ice to provide insulated shelters for themselves and their pups. Early breakup of sea ice threatens lairs during critical rearing periods when pups are too young to survive in water, according to the group. Warming also can expose lairs and make pups vulnerable to polar bears and Arctic foxes. Bearded seals give birth and rear pups on drifting pack ice over shallow waters where prey is abundant. The retreat of sea ice away from shallow shelves decreases food availability, the environmental group said. Federal agencies are required to consider how their regulatory decisions affect listed and threatened species. ___ On the Net: Center for Biological Diversity: NOAA Fisheries Alaska: http://www.fakr.noaa.gov/
http://www.biologicaldiversity.org/
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