the immigrants used the resident solution on their first try. Chimento says that this stark result makes a compelling case that social learning was at play. "Of course, we can't ask the birds ...

"Throughout the United States, we see changes over time in birds wintering farther north than they used to, as the overall ... "Robins are really good at moving locally to find fruit," he said.

A mild winter with low or no snow to cover fields allows birds such as sandhill cranes and Canada geese to stay in Wisconsin.