Many wild-bird supply stores offer dozens of different kinds and mixes of seed and other types of food for your backyard birds. When you make the purchase are you buying with birds or your own perceptions first in mind? What, exactly, do birds want? There is an ongoing study, in which you can participate, seeking to answer that question. The Wild Bird Research Foundation is collecting information on seed preference from people who feed birds. You can sign up and contribute, or simply take a look at information gathered in 2006 and 2007. The Web address is www.projectwildbird.org. (Photo: An American Goldfinch, molting into breeding plumage, at a feeder filled with black oil sunflower seeds.)

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