Seventy dollars – that's the market price of a bird seen over the weekend at a feeder in Franconia, Minnesota. Mr. and Mrs. Rubin Stenseng had a European Goldfinch at one of their feeders. That species, found across northern Europe from Scandinavia east into Russia, is sold here as a cage bird. The price I found in a quick Internet search was $140 a pair. The Franconia bird, seen once and photographed by Mr. Stenseng, is surely an escapee or a bird that was released by its owner. European Goldfinches migrate to warmer climes in the winter, so this bird is unlikely to survive very long. Mr. Stenseng and his wife participate in Project Feederwatch on weekends, keeping an eye on the seven feeders they have in their yard. Sunday was a good day for goldfinches, our species, the American Goldfinch, numbering 31, an extra-high number, he said. The European visitor was among those birds. It's a pretty bird, as Stenseng's photos show. Feederwatch, by the way, is a citizen science project run by the Cornell Lab of Ornithology. It helps researchers keep track of number and location of birds throughout the country. You can participate. See http://www.birds.cornell.edu/page.aspx?pid=1664&ac=ac