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| Double click on the bird of your choice to find out more information about that species. | We invite you to learn more about each of the winter finches and the
Red-breasted Nuthatch--what they look like, what they sound like, and where
they made appearances--by clicking on the species of your choice. Using Geographic Information Systems, we created animated maps illustrating the southward movement of each of the winter finch species. Postal codes provided by participants on the survey form were converted into specific latitudes and longitudes. Initial maps were created for all reports between August 1 and October 31, 1997, then were animated to reflect observations from ten-day periods thereafter. In this way, you can see how winter finches moved through North America.
You helped make the maps that much more accurate. Below is an animated map showing the invasion of all winter finches, based on reports prior to 31 December1997.
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