Tweets,

In the U. S., at least, banded birds and sightings of birds with color markers can be reported at this site.

https://www.pwrc.usgs.gov/BBL/bblretrv/

The banding lab. will then report the information to the researchers involved, and you'll get information about the bird.  This applies to any wild species (not racing pigeons nor escaped pets). 

Cheers,

Alan Grenon
panmail AT mailfence.com
Seattle

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