Two are Brent Geese, which were both ringed on the Exe in 1996, and have been returning here probably every winter since. There's a website (www.geese.org) where you can register and log your sightings, and as a handy bonus of modern technology, you get an instant history of the bird. Here they are:
This bird was ringed at Powderham, in the winter of 1996, and has been seen in several places along the western European section of the migration route over the years. A total of 61 logged sightings too, which is pretty impressive:

This bird hasn't been seen so widely, but still has 37 logged sightings over the 12 years since ringing:

A closer look shows something of the widespread use they make of the Exe:

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