There have been a few examples of Lesser Redpoll and Siskin bearing aviculture rings and then migrating with wild birds and being subsequently caught by ringers. We have had two examples of Lesser Redpoll in the last two springs at Heysham Obs
The 2012 bird was traced to 'ornithologiste francais' (uncertain of the actual spelling here as cannot find a google link), but there were no responses to enquiries
A further individual bearing a closed ring was part of a northbound movement of Lesser Redpoll on the morning of 7th May 2013. Professor David Norman alerted us to the origin of this bird and contact was made with the secretary of the International Ornithological Association, Alan Robinson. Alan acted immediately to trace origin of the bird within the limitations of the Data Protection Act (town or general area only) and the bird was traced to Chelmsford, Essex where it was ringed as an aviculturally-reared nestling in 2011
This is also the general direction from which many of our long-distance Lesser Redpolls bearing BTO rings have come. Therefore presumably this bird joined wintering Lesser Redpolls on feeders and became part of the subsequent spring migratory movement.
Thanks to Professor Norman and Alan Robinson for help determining the origin of this bird The IOA website can be seen here: