Ruff

Black flag with a white three alpha-numeric code, starting letter "R" (on left tibia) and metal ring (on right tibia).

note 1 :

Black flag with a white three alpha code, starting letter "R" (on left tibia) and metal ring (on right tibia).

note 1 :

Combination of:
* four c-rings (two c-rings (on left tibia) and two c-ring (on right tibia) - one of the four c-rings is always coded).
* coded c-ring is always yellow with black (niger) engraving using letter “A”.

note 1 : used colours for uncoded c-rings are: red, black (niger), dark-green, pale (light-blue) and dark-blue.

note 2: metal ring is not part of the combination and is mostly on right tarsus.

note 3 :

Red ring with three alpha-numeric code (3 letters/numbers), starting letter "A", and black uncoded ring.

note 1 :

Combination of :
* one c-ring (on left tarsus).
* one c-ring (on right tibia).
* one c-ring (on right tarsus).
* metal ring (on left tibia).

note 1 : used colours : dark-blue, dark-green, violet (mauve, purple, lilac), orange, red, white and yellow.

note 2 : always at least one orange ring.

note 3 :

Combination of :
* black ring with a two numeric code (on left tibia).
* yellow ring (on right tibia).
* metal ring (on right tarsus).

note 1 : used numbers are : 00-99.

note 2 :

Combination of :
* orange ring with a two alpha code (on right tibia).
* orange ring (on right tibia).
* metal ring (on left tarsus).

note 1 : used letters : A, C, E, H, J, K, L, M, N, P, T, U, V, X, Y.

note 2 :

Combination of :
* red ring with a two alpha-numeric code (on left tibia).
* metal ring (on right tarsus).

note 1 : used letters and numbers for alpha-numeric code are : A, C, E, H, J, L, M, P, T, U, V, X, Y, 0-9.

note 2 :

Combination of :
* one coded flag (letter X) (on tibia).
* 1 or 2 c-rings (on left tibia).
* 1 or 2 c-rings (on right tibia).
* metal ring (on tibia above the rings or on tarsus ).

note 1 : used colour for the flags is: yellow with black X and the flag is the so-called marker of the project; there is always a black X on the flag to distinguish it from the French scheme with Orange flag but tho code itself is not important.

note 2 : used colours for the rings are: yellow, red, dark blue, green and white

note 3 : always the flag and 1 c-ring on one leg and 2 c-rings on the other leg, the flag can be above or below the c-ring, rings and flag always on the tibia.

note 4 : metal ring is no part of the code.

note 5 : Research Ruff :  https://www.rug.nl/research/gelifes/ceg/_piersma/ruffs

note 6 : Browse the ISWG register, but before read "How to use the register".

note 7 : 

Combination of :
* white flag with a two alpha-numeric code (on left tibia).
* two dark green rings (on left tibia, one above flag and one below flag).
* metal ring (on right tarsus).

note 1 : used letters and numbers are:  A, B, C, F, H, J, K, L, M, N, P, R, S, T, U, X, Y and 0-9.

note 2 :