Eurasian Tree Sparrow

Yellow ring with a black three alpha-numeric code (on left tarsus) and metal ring (on right tarsus).​

​note 1 : used codes are : A / number / number.

note 2 : birds ringed in Norfolk, UK.

note 3 : 

Yellow ring with a black 3 alpha code (on left leg) and metal ring (on right leg).

note 1 : codes used starting letter "A" + letter+ letter.

note 2 : birds ringed in Fife, Scotland.

note 3 : 

Combination of :
* yellow witn with a black two-alpha-numeric code (on left leg). 
* c-ring (a changing year colour) above the metal ring (on right leg).

note 1 : used colours as year code are : for 2018 :  

note 2 : 

Yellow ring with a black three alpha-numeric code : B-number-letter or B-letter-number (on left tarsus) and metal ring (on right tarsus).​

​note 1 : the study area is an Apples and Pears trees plantation in Navarra region (North of Spain).

note 2 : expected results are :
- are nest boxes used always by the same pairs ?
- are tree sparrows present all the year in the breeding area?
- what is the survival of the adult tree sparrows? And in the case of the chicks ?
- do sparrow chicks return to the same area where they were born?
- are the nest boxed occupied mainly by individuals born in nest boxes ?.
- how far the tree sparrow chicks reach in their dispersion ?

note :  

Lime (light-green) ring with a black 3 alpha-numeric code (on left leg) and metal ring (on right leg). 

note 1 : codes used: A00-99.

note 2 : birds ringed in Oxfordshire, UK.

note 3 : 

Combination of c-rings : metal ring (on right tarsus) and red over white (on left tarsus).

note 1 : birds ringed from 2017 onwards in the area of Ochsenhausen, Germany.

note 2 : 

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

note 1 :   

Combination of c-rings :
* c-ring on top of the metal ring (on left leg). 
* 1 or 2 c-rings (on right leg).

note 1 : all c-rings on both legs, but always on the tarsi.

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

 note 3 : birds ringed in Eastermar, Fryslân, The Netherlands.

note 4 : project started in 2015.

note 5 : project ended in 2020.

note 6 :

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 :