In the column “Since You Asked” in every issue of BirdWatching, Contributing Editor Julie Craves answers readers’ questions about birds and bird behavior. Here is a question from our November/December 2018 issue.
Q: Last year, I took pictures of molting goldfinches at my feeders. It wasn’t until going through the pictures later that I noticed one male had a leg band. Can you shed some light on who may have banded this finch or where it has traveled from? — Jason Breckenridge, Bluevale, Ontario
A: Your photos are terrific, but unfortunately you did not get shots of all the numbers on the band. In nearly every case, every digit would be needed to trace the bird. Standard plain aluminum bird bands have nine digits: a four-digit prefix and a five-digit suffix.
With that number, you can report a band in the U.S. or Canada at www.reportband.gov. The North American Bird Banding Program is administered by the U.S. Geological Survey and Canadian Wildlife Service. All licensed banders send their data to one of these entities, so there is no need to try to hunt down individual banders.
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Birds with other markers, such as geese with colored alpha-numeric neck bands, can be reported with or without the regular leg band number. It’s important to note the size, shape, and color of a marker, color of codes (letters or numbers or both), and the shape and placement of codes on the marker (for example, which are written horizontally
When you report the band or marker, you’ll be guided to provide additional information, such as how you obtained the band number, the date, location, and the species and current status of the bird. In most cases, you’ll get immediate feedback, and you can also request a certificate of appreciation. A low percentage of birds — especially songbirds — are ever reported away from their banding sites. (Much of the valuable data obtained by banding is gathered when the bird is originally banded.) You can make an important contribution!
Note that these agencies do not track pigeon bands, which are often colored plastic over metal. They usually have two to four letters, followed by a two-digit year, and then a four- to five-digit number. If you find a banded pigeon, contact the American Racing Pigeon Union.
If you are still curious about nearby banders, you can take a look at the Canadian Migration Monitoring Network page at Bird Studies Canada for a directory of major banding stations near you. However, goldfinches can be real wanderers. A goldfinch I banded in Dearborn, Michigan, was recaptured by a bander seven months later in Fergus, Ontario, about 50 miles away from you. It was one of several birds of various species I’ve banded in Michigan that ended up in southwestern Ontario.