Rook (Corvus frugilegus) with yellow plastic rings

    Ráby – The author has been ringing the European Rook (Corvus frugilegus) for 28 years. He catches the birds in fields near a village using an aviary. Overall he has ringed more than 17000 rooks so far. He also started to use yellow darvics with black code (three figures from 003 to 250) since January 2010. If you find a rook with color ring on his leg, please send a report to this address – cesakjiri@email.cz.