Herons

Combination of 2 or 3 c-rings without code (on one leg) and only a metal ring or also a colour ring above (on the other leg).

note 1 : used small (1 cm height) colours are : white, dark blue, dark green, light green (pistachio), red, orange, yellow. Rings are above the knees.

note 2 : the programm started in 2009 at Lac de Grand-Lieu, Loire Atlantique, France

note 3 : for controls, mention ring from up to down for each  leg and precise kind of green (dark or light).