Colour code
The birds of this project have 1 color ring with 2 characters.
The color code consists of 3 consecutive elements:
- the letter of the color
 - a hyphen ("-")
 - the inscription (always 2 characters)
 
Example W-AA. This bird has a white colour ring with the inscription AA on it.
In some projects there may be a special sign (eg a dot or a vertical bar) on the ring that may be important in recognizing the bird. Example W-A.A
colour-letters
- B = dark Blue
 - G = dark Green
 - L = light green ("Lime")
 - N = black ("Noir")
 - O = Orange
 - R = Red
 - W = White
 - Y = Yellow
 



