Ruff

Combination of :

* white flag with a three alpha 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 are:  A, C, E, H, J, K, L, N, P, T, U, V.

note 2 : 

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

note 1 : used colours are : orange, red, yellow, white, dark-green.

note 2 : 

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

note 1 : used ccodes : 000-200.

note 2 :  

Combination of :
​* Blue flag with a white three alpha-numeric code (on left tibia)
​* orange ring (on right tibia)
​* metal ring (on right tarsus).

note 1 :  

Combination of c-rings :
* 2 c-rings (on left tarsus).
* black ring (on right tibia).
​* c-ring over metal ring (on right tarsus).

​note 1 : used colours are : white, yellow, orange, red, cyan, light-green/lime, dark-green, pale-blue, dark-blue, violet, black. 

note 2 : 

Dark-blue flag with a white two alpha code (on left tibia) and metal ring (on right tibia).

​note 1 :  used codes are : AA - ZZ.

note 2 : 

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

note 1 :  used codes are : IAA - IZZ.

note 2 : 

Combination of :
* c-ring over white flag with a black two alpha code over c-ring (on left tibia).
* metal ring (on right tibia).

note 1 : 

Combination of :
* orange ring (as marker) (on left tibia).
* light-green (lime) flag with a black three alpha code (on right tibia).
* metal ring (on left tarsus).

note 1 : birds ringed since 2016.

note 2 : used letters are : A, C, E, H, J, K, L, M, N, P, T, U, V, X, Y, Z.

note 3 :

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

note 1 : used colours for flags and rings are : red, white, blue and yellow and the flag is the so-called marker of the project, can be on the tibia or tarsus.

note 2 : always 2 c-rings on the left leg and 2 c-rings on the right leg, always on the tarsus.

note 3 : metal ring always on the tibia and is no part of the code.

note 4 : the position of the flag against the c-rings is important : above, under or between the c-rings.

note 5 : Colour Ring Scheme Ruff :  http://www.rug.nl/research/institute-evolutionary-life-sciences/ceg/_pie...

note 6 : pictures available : http://www.rug.nl/research/institute-evolutionary-life-sciences/ceg/_pdf/ruff_kleurringen.pdf

note 7 : Browse the ISWG register, but before read "How to use the register".

note 8 :