Number of birds in the US and Canada falls by 29 percent, or almost three billion, since 1970 – study
A Red-bellied Woodpecker perches on a suet feeder during a winter storm in the village of Nyack, New York, on January 21, 2012.
But forest birds and species that occur in a wider variety of habitats – known as habitat generalists – are also part of the downward trend. More than 90 percent of the losses are from 12 species including sparrows, warblers, blackbirds, and finches. The second source came from observations from 143 radar stations which can detect the flocks of birds during migrations that took place at night.
Ducks and geese are the big exception: after a period of decline, their numbers have grown since 1970.
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