Combination of 1 and 2 c-rings.
note 1 : used colours are : red, orange, lime, pink, blue, green, violet, white) 1 and 2 plastic rings/bird for the individual identification. In case of every crow we use scheme ring as well.
note 2 : bird are catched by traps (ladder, Larsen, Swedish, bow net) from 2013. We have marked almost 30 rooks already, our work is continuous during the autumn and winter.
note 3 : the aim of our activity to test the efficiency of traps and gather information about the crows, who come from abroad (Ukraine, Poland) for wintering.
note 4 :