Common Tern

Green ring with a white three alpha-numeric code and a dot in the code (always after the 1st or 2nd digit in the code).

note 1 : letter 'N' on the first position OR letter 'N' on the 2nd or 3rd position (eg. N.AC or 2N.3).

note 2 : the letter N is followed by one letter and one number (eg. NV2 or N2V), by two numbers (eg. N42), starting with two numbers (eg.01N) or in the number-N-number (eg.7N8)

note 3 : used letters are : A, C, F, H, K, L, N, P, R, S, T, V, X, Z. Used numbers are 0, 1, 2, 3, 4, 5, 6, 7, 8, 9.

note 4 : we use colour-rings to gain information on habitat use, juvenile dispersal, age of return and recruitment to the breeding colonies in the southwest of The Netherlands or beyond.

note 5 : 

Black ring with a white three alpha-numeric code.

note 1 : letter 'N' on the first position

note 2 : the letter N is followed by one letter and one number (eg. NV2 or N2V), by two numbers (eg. N42), starting with two numbers (eg.01N) or in the number-N-number (eg.7N8)

note 3 : used letters are : A, C, F, H, K, L, N, P, R, S, T, V, X, Z. Used numbers are 0, 1, 2, 3, 4, 5, 6, 7, 8, 9.

note 4 : we use colour-rings to gain information on habitat use, juvenile dispersal, age of return and recruitment to the breeding colonies in the southwest of The Netherlands or beyond.

Orange ring with a black three numeric code.

note 1 : used codes: 400 - 499.

note 2 : birds ringed in Cumbria and North Lancs, UK.

note 3 : 

Yellow ring with a black two alpha code.

note 1 : used codes are : AA-EZ.

note 2 :

Yellow flag with a black three numeric code (on right tarsus) and metal ring (on left tarsus).

note 1 : used codes 100-299 (100 - 139 in 2024).

note 2 : Common Terns, caught on nest and ringed as adult breeders in Neufelderkoog (Germany) during avian influenza antibody monitoring.

note 3 : project running time : 2024 - 2028.

note 4 :

Red ring with a white three alpha code.

note 1 :

Dark-blue ring with a white three alpha-numeric code, starting letter 'L or H' (on one leg) and metal ring (on other leg).

note 1 : L0A-L9Z and LA0-LZ9.

note 2 :

Dark-green ring with a white 3 numeric code.

note 1 : used codes are 600-699, with a ‘dot’ after the number six (e.g. 6.01).

note 2 : birds ringed at Lough Atalia in Galway City, Lough Ree in counties Longford/Roscommon/Westmeath and other sites in the midlands and west of Ireland.

note 3 :

Red legring with a white three alpha code (on tarsus left) and metal ring (on tarsus right).

note 1 : to be read from bottom till top.

note 2 : project started in 2024.

note 3 :

Orange ring with a black three numeric code (700 - 799) (on left leg) and metal ring (on right leg).

note 1 : birds ringed in Cork, Ireland.

note 2 :