Coordination of colour and code is necessary, otherwise with the exponential booming of cr-projects colour-ring birding runs into a disaster.
Despite all efforts to coordinate colour-ringed species (colours and codes) some project leaders started illegal their project. This could lead to ‘unknown projects’ and mystery sightings.
Under you can find a list of cr-mystery birds.
Feel free to contact the observer and let me know something is the mystery is solved.
Great Skua : legring : blue four alpha-numeric code.
Red Kite : wingtag : blue 83
Red Kite : wingtag : white E1
Stone Curlew : legrings : green/orange/orange left
Herring Gull : legring : blue taped ring
Meadow pipit : wingtag : maybe a small white wingtag