White ring with two alpha-numeric code (letter/number, number/letter) (on the right tarsus) and metal ring (on the left tarsus).
note 1 :
White ring with two numeric code (on the right tarsus) and metal ring (on the left tarsus).
Yellow wingtag with black two numeric code.
note 1 : wingtag on one wing.
note 2 :
Dark-green ring with a white three numeric code.
Dark-blue ring with a white three alpha code, starting letter "C" (on left leg) and metal ring (on right leg).
White ring with a black two alpha code (on one leg) and metal ring (on other leg).
note 1 : birds are ringed in Friesland and Groningen, The Netherlands.
Yellow ring with a black two alpha code (on one leg) and metal ring (on other leg).
White wingtag with a black three alpha-numeric code : letter "X" followed by two numbers.
note 1 : used codes are X01-X50.
note 2 : birds ringed in Eastern Germany, Saxony, near Görlitz.
note 3 :
Red ring with a white two alpha code (on one leg) and a metal ring (on other leg).
note 1 : the project was started in 2011.
note 2 : a captured bird with a metal ring on the left tarsus becomes the red ring on the right tarsus.