Cormorants live in a wide range of inland and coastal wetlands all over Europe: their breeding grounds range from the western Atlantic and Baltic areas till northern Italy and eastern Europe. Flyways to prime wintering areas in central Europe and the Mediterranean basin cross all Europe, so Great cormorants may be observed almost everywhere.
To study post-breeding dispersion, migratory and stop-over patterns, individual survival, and many other aspects of cormorant ecology each breeding season hundreds of nestlings are colour-ringed in many colonies in almost all European countries.
In order to avoid overlapping of colour-ringing schemes, the Cormorant Research Study Group coordinates colour-ringing projects in Europe.
If you see a cormorants wearing a colored leg ring, please note the specific location, date, details of the plumage, ring position (right or left tarsus), colour(s) and inscription (combination of numbers / letters / bar).
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