Perhaps a Pet?
European Goldfinch - These birds are not native to North America, but have been sighted in increasing numbers (a few hundred) in Wisconsin, Illinois, New York, New Jersey, Maryland, and Delaware. I spotted this one at my feeders in January and February of 2016 on snowy days. It was alone, but traveling with a flock of about 30 American Goldfinches. The Maryland Biodiversity Project documented the sighting on their Facebook page and I recorded it with photos on the EBird site. It is likely these birds were transported here via the pet trade.