Terns

Combination of c-rings.

note 1 : right tarsus : 2 plastic rings or 1 plastic ring with metal ring ; left tarsus : 2 plastic rings or 1 plastic ring with metal ring.

note 2 : used colours are red, blue, white, green, violet, orange, yellow and black.

note 3 : birds are ringed in The Brenne, Central France during 2002 and as well adult as juvenile birds are involved.