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.
Chris Florian, left, and Skip Ambrose pose on the bank of the Yukon River during a trip to monitor peregrine falcon nests in July 2018. Ambrose thinks the population of peregrines stabilized by 2012, when the birds occupied 60 territories in the upper Yukon study area and most every good cliff nesting site was taken. The comeback took 40 years, and Ambrose had a front-row seat for the show. But he has seen things change during the last few years.
Ambrose and Florian think the avian bird flu is probably killing adult peregrine falcons, maybe before they get to Alaska. Peregrines, which live an average of six-to-seven years, migrate from the breeding grounds of the far north to the southern United States, Central and South America. Skip Ambrose holds a peregrine falcon during a trip to monitor the birds along the upper Yukon River in 1985.
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