Warblers

Combination of :
​* 1 metal ring and 2 c-rings (on either leg).
the metal ring is part of the combination.

note 1 : used colours are : dark-green, black, yellow, red, blue and white.

note 2 : birds will be ringed on Ouessant Island, Brittany, France.

note 3 :
https://www.birdguides.com/articles/look-out-for-colour-ringed-yellow-br...