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The exception to the rule: retreating ice front makes Bewick's swans Cygnus columbianus bewickii migrate slower in spring than in autumn

In the vast majority of migratory bird species studied so far, spring migration has been found to proceed faster than autumn migration. In spring, selection pressures for rapid migration are ...
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Trumpeter swans, once nearly extinct in the lower 48, now winter at the confluence by the thousands

In winter, about 10 phone calls a day come into the Audubon Center at the Riverlands Migratory Bird Sanctuary, near Alton, from folks hoping to see swans. “Some days, it’s nonstop,” says the center’s ...
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Cygnus columbianus

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JSTOR Daily

Bewick's Swans Refuelling on Pondweed Tubers in the Dvina Bay (White Sea) during Their Spring Migration: First Come, First Served

Journal of Avian Biology, Vol. 29, No. 4, Optimal Migration (Dec., 1998), pp. 574-581 (8 pages) Current models of bird migration consider the optimal decision making of individuals irrespective of the ...