The Chaffinch (Fringillidae coelebs) is a fairly common bird throughout Europe. There have been other records of this bird in Massachusetts -- although many of them are dismissed as released caged birds. Since this was a young bird showing a lot of feather wear, it's quite possible that this is an "authentic" bird. While not highly migratory (in the milder climates) these birds are known to form loose flocks and leave the colder regions, with some straying to eastern No. America. We may never know........Hopefully this bird -- or another like him -- will appear in a more accessible, public area so that more birders get the chance to see him.