Some ten percent of all species of birds hybridize. Two of the birds that hybridize with one another are the white-throated sparrow and dark-eyed junco.
Among the places where white-throated sparrow/dark-eyed juncos hybrids are known to occur are Canada, New York, Maryland, Virginia, Pennsylvania, Connecticut, Arkansas, and Georgia.
Since both species are routinely seen throughout most Georgia during the winter, it is possible that one or more of these rare birds has visited your yard.
As you might expect, hybrids will display traits of both species. Although, the plumage of these birds is highly variable, many have pink bills, brown wings, and gray coloration on their breasts and heads. Their songs are known to exhibit bits and pieces of the songs sung by each species.
Antidotal evidence suggests these unlikely hybrids are more often seen in the company of sparrows than juncos.
If you pay close attention to the sparrows visiting your feeders this year, you just might spot one of these unusual birds. If you do observe a sparrow that you feel might be a hybrid, take a picture of it, and let me know. Who knows? There may be more of these odd birds flying about than we realize.