31 octubre, 2012

Alaska trumpeter swans filling historic range


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Alaska trumpeter swans filling historic range




It was likely easier than ever to see a migrating trumpeter swan this year, as the big white birds continued a remarkable comeback from near extinction in the Lower 48 states and much of their Alaska habitat, a federal wildlife biologist said.
"They still have not recovered to their full range that they once occupied prior to the 1880s, but they've done fantastically in Alaska," said Deborah Groves, who has counted Alaska swans since 1990.
A 1968 Alaska census found just 2,847 of the birds. Random sampling in 2010 estimated 25,347 -- a nearly nine-fold increase.

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