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 color ring with the inscription AA on it.
colour-letters
- B = dark Blue
- N = black ("Noir")
- R = Red
- W = White
- Y = "Yellow"