Population of Yukon River peregrines nosedives


An adult peregrine falcon in flight over Alaska. Image-Ted Swem

Numbers of adult peregrine falcons on the upper Yukon River in Alaska have decreased by more than a third in the last three years, according to a scientist who has counted them there for half a century.

Skip Ambrose is a biologist who has observed Yukon River peregrine falcons since 1973, missing only three years along the way.

He and his wife Chris Florian returned from 2023’s trip having seen only 77 adult peregrine falcons in the 166-mile stretch from the Yukon border to Circle. That is a 34 percent decrease in the average number of adult

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