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The polar bear death is a sign of the unusually persistent and lethal hold that this strain of highly pathogenic avian influenza has on wild animal populations two years after it arrived in North ...

Scientists say it’s being caused by a misbehaving polar vortex combining with a key ... The frequent emergence of this pattern this winter could be a sign of things to come in a warming world.

The polar bear death is a sign of the unusually persistent and lethal hold that this strain of highly pathogenic avian influenza has on wild animal populations two years after it arrived in North ...