Common Kestrel

Brown ring with a white two alpha code (on left leg) and metal ring (on right leg).

note 1 : birds ringed in Gloucestershire, UK.

note 2 : 

Silver ring with a black three alpha-numeric code. (number-number and under a letter).

note 1 :  used numbers : 16-86 ; used letters : A - Z.

note 2 : 
 

Black ring with a white three alpha code (letter/letter/letter) (on left leg) and metal ring (on right leg).

note 1 : birds ringed northern England.

note 2 : codes starting N, P, S, T, V or X.

note 3 : 

White ring with a black two alpha code (on left leg) and metal ring (on right leg).

note 1 : birds ringed in West Midlands, England.

note 2 : 

Yellow ring with a black three alpha-numeric code : letter - letter - number.

note 1 : except starting-letter "R".

note 2 : 

Black ring with a white three alpha-numeric code.

note 1 : used codes are : 0AH to 9ZZ.

note 2 : 

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 letter "V", "X" or "Z" followed by 2 numbers (on left tarsus) and BTO-metal ring (on right tarsus).

note 1 : birds ringed in Cheshire, UK.

note 2 :