Eurasian Tree Sparrow

Combination of :
* orange with a white one alpha code (letter 'A') and metal ring.
OR
* black ring with a white one alpha code (letter 'A') and metal ring.
OR
*white ring with a black one alpha code (letter'A') and metal ring.
OR
*yellow ring with a black one alpha code (letter 'A') and metal ring.
AND
* combination of 2 c-rings.

note 1 : coded ring and combination of c-rings can be on either tarsus.

note 2 : metal ring is part of the combination.

note 3 : 

Combination of c-rings :
* c-ring under metal ring (on right leg) 
* 2 c-rings (on left leg).

note 1 : c-rings are three different colours.

note 2 : used colours are : blue, black, green, red, orange, white , yellow, purple, grey

note 3 : birds ringed in Zwolle, Overijssel, The Netherlands.

note 4 : project started in 2013.

note 5 :

Dark-green ring with a white three numeric code (on left tarsus) and metal ring (on right tarsus).

note 1 : used codes : 001-100.

note 2 :

White ring with a black three numeric code (on left tarsus) and metal ring (on right tarsus).

note 1 : used codes : 001-100.

note 2 :

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

note 1 : during 2015 black is used as c-ring above the metal ring. By October 2015 red is used. Later purple/mauve, pink and orange will be used ... as the marker of the project. 

note 2 : used colours (on left leg) are : red, white, blue, yellow, green and black.

note 3 : birds ringed in Denmark.

note 4 : 

Red ring with a white two alpha-numeric code (on left leg) and metal ring (on right leg).

note 1 : birds ringed in the UK, Cleveland.

note 2 :

White ring with a black three alpha-code, starting letter 'C' followed by letter/letter (on left tarsus) and metal ring (on right tarsus).

note 1 :  used codes are : CAA till CZZ. 

note 2 : 

White ring with a black three alpha-numeric code, starting letter 'C' followed by letter/number or number/letter (on left tarsus) and metal ring (on right tarsus).

note 1 :  used codes are : CA0 till CZ9 OR C0A till C9Z. 

note 2 : 

White ring with a black three alpha-numeric code, starting letter 'E' followed by two numbers (on one leg) and metal ring (on other leg).

note 1 : used codes are E00-E30 in 2009.

note 2 : afterwards used codes will be E31-E99.

note 3 :   

Combination of c-rings :
- orange ring over or under metal ring (on left or right leg).
- two c-rings (on left or right leg).

note 1 : used colours are : dark-blue, black, dark-green, red, orange, white , yellow, purple, pink.

note 2 : birds ringed near Olst, Overijssel, The Netherlands.