Terns

species: 
Caspian Tern
scientific name: 
Hydroprogne caspia
notes: 

Red ring with a white four alpha-numeric code (on one leg) and metal ring (on other leg).

note 1 : first letters are : A, C, F, H, J, K, L, M, N, R, T, U, Y.

note 2 : 

website sighting submit: 
Ringmärkningscentralen.
email sighting submit: 
website information: 
Riksmuseum Stockholm.
colour-ring type: 
Legring : one, coded.
colour-ring colour (of the c-ring): 
Red [R]
colour-ring code (of the c-ring): 
Four alpha-numeric code (4 letters/numbers).
countries where ringed: 
Sweden.