North American avian species that migrate in flocks show greater long-term non-breeding range shift rates by Stephen H. Vickers, Timothy D. Meehan, Nicole L. Michel, Aldina M. A. Franco, James J. Gilroy

“…Methods Here we used 50 years of North American Breeding Bird Survey and Audubon Christmas Bird Count data to test the prediction that breeding and/or non-breeding range-shifts are more prevalent among flocking migrants, which possess a capacity for rapid social transmission of novel migration routes. …”
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