Lesser Black-backed Gull

Combination of three c-rings.

note 1 :

Combination of c-rings (on both tibia or tarsus left or right).

note 1 : it is necessary to mark the age of the bird.

note 2 : the rings are small, pigeon-type.

note 3 : on left or right tibia is a metal Paris-ring.

note 4 : the project concerns birds touched by botulism's in the Pas-de-Calais, France.

Brown ring with a white three alpha-numeric code : 1 number and two letters.

note 1 : used codes are OAH-7DH.

Brown ring with a white three alpha-numeric code, starting letter 'S'.

note 1 :

Brown ring with a white three alpha-numeric code.

note 1 : used codes on 61 birds in 1997 are : 1AS-7JS.

note 2: these code is not used : 5CS, 0DS, 5ES, 2HS and 9HS.

Grey ring with a black three alpha-numeric code.

note 1 : used codes are 1AG-4MG.

Grey ring with a black three alpha-numeric code.

note 1 : used codes on 90 birds in 1995 is: 1AS-0MS.

Grey (silver) ring with a red two alpha code.

note 1 : used codes are with a ":" or a "+" or a "=" between the two letters.

note 2 :

Grey ring with a black three alpha-numeric code : number/letter/letter 'F'.

note 1 :

Yellow ring with a black three alpha-numeric code.

note 1 : used codes are 1AG-9MG.