Common Kestrel

Light-green (lime) ring with a black three alpha-numeric code.

note 1 : used code is : letter/number/number.

note 2 : after the letter is a vertical line: |.

note 3 : used codes are : A|00-A|99 with the next letters of the alphabet.

note 4 : mainly adult birds are ringed, started in January 2025.

note 5 :

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

note 1 : combination is : number-number-letter ; used codes are : 00C – 99Z ; used letters are : C, E, G, J, K, L, M, P, T, U, V, Y, Z. ; used numbers are : 0, 1, 2, 3, 4, 5, 7, 9.

​note 2 : birds ringed in North-Limburg, The Netherlands.

note 3 :

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

note 1 : used code : number/number/letter.

note 2 : used codes are : 11A, 11B, 11C ~~ 11Z, 12A ~~ 12Z, 99A ~~ 99Z
excluded letters : I, O, Q, L and excluded number : 0.

note 3 : project starts in 2024.

note 4 :

Orange ring with a black three alpha-numeric code (starting V (V01-V99)) (on left tarsus) and BTO-metal ring (on right tarsus).

note 1 : birds ringed in Cheshire, UK.

note 2 :

Blue ring with three alpha code, starting letter "X" (2021) of "W" (2022) (on one leg) and metal ring (on other leg).

note  1 :

Combination of :
* a red ring with a white two alpha-numeric code (A0-Z9) over a c-ring (on left leg).
* metal ring (on right leg).

note 1 : colours of the c-ring can change every year. Used colours are : yellow (2024), dark-blue (2025), white (2026), dark-green (2027), light-blue (2027, ...

note 2 :

Dark-blue ring with a white three alpha code, first and second letter separated by a vertical line.

note 1 : used codes are : E|AA-E|ZZ, F|AA-F|ZZ, G|AA-G|ZZ, H|AA-H|ZZ, I|AA-I|ZZ, etc.

note 2 :

Silver-grey ring with a black two alpha code.

note 1 :

Silver-grey ring with a black two alpha-numeric code.

note 1 :

Orange ring with a black 3 alpha code (on left leg) and metal ring (on right leg).

note 1 : codes used BAA-BZZ.

note 2 : birds ringed in Leicestershire, UK.

note 3 :