Rook

White ring with a black four alpha-numeric code (on one leg) and metal ring (on other leg).

note 1 : up to 2014, a total of 680 rings delivered 2004-2013.

note 2 :

Yellow ring with a four alpha-numeric code, starting letter "U" followed by a three numeric code or from 2023 onwards : yellow U + letter + 2 numbers.

note 1 : used codes are U000 -U099.

note 2 : used codes are UA00 ... .

note 3 :

Red ring with a white three alpha code (on left tarsus) and metal ring (on right tarsus).

note 1 :

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 :

White ring with a black three alpha-numeric code. 

note 1 : from 2004 to 2006 in León county (NW Spain) 78 birds were ringed.

note 2 :

Dark-blue ring with a white three numeric code.

note 1 : used codes are 001-100.

note 2 :

Dark-blue ring with a white three numeric code.

note 1 : used codes are 001-100.

note 2 :

Combination of 2-3 c-rings : metal ring (on left leg) and 2 c-rings (on right leg) OR 1 c-ring above metal (on left leg) and 2 c-rings (on right leg).

note 1 : birds ringed in UK, county Cambridgeshire.

note 2 : used colours are white, green, yellow, orange, red, blue, silver; red, blue and green with white stripe.

Combination of 3 c-rings : 1 c-ring above metal ring (on left leg) and 2 c-rings (on right leg).

note 1 : birds ringed in UK, county Cornwall.

note 2 : used colours are white, green, yellow, orange, red, brown, violet, blue, silver.

Dark-green ring with a white three alpha-numeric code.

note 1 : used codes are : (letter/number/number ; letter-letter-number, letter-number-letter, number-letter-letter, number-letter-letter).
 
note 2 :