Arctic Tern

White ring with black 2 alpha code (on one leg) and metal ring (on other leg).

note 1 : used codes are: CA-CZ, FA-FZ,LA-LZ, PA-PZ, RA-RZ, XA-XZ.

note 2 : since 2009, 215 individuals caught.

note 2 : this is a RAS-project in Groningen, The Netherlands.

note 3 : the adults were ringed in Delfzijl and Eemshaven.

note 4 :

Dark-blue ring with a white two numeric code (on one leg) and metal ring (on the other leg).

note 1 : birds (mostly nestlings) ringed in Eemshaven, The Netherlands from 2013 onwards.

note 2 :  

Dark-blue ring with a white two alpha code (on one leg) and metal ring ( on the other leg).

note 1 : birds ringed in Eemshaven or at Griend, The Netherlands.

note 2 :  

Yellow ring with a black two numeric code.

note 1 : used codes are 8.0 - 9.9.

note 2 : these birds are used to put geolocators on. When caught in 2015 or later, please take off the geolocator.

note 3 : Codes 0.0 till 7.9 are ringed by Date Lutterop. Please send observations of these birds to d.lutterop@ziggo.nl

note 4 :

Yellow ring with a black two alpha code (on left leg) and BTO-ring (on right leg).

note 1 : birds will be ringed at colonies on Isle of Man, British Isles from 2014 onwards.

note 2 :

White ring with black 2 alpha-numeric code (number/letter P or letter P/number.

note 1 : used codes since 2009 ; since 2010 also XA-XZ , FA-FZ and LA- LZ used on adults.

note 2 : this is a RAS-project in Groningen, The Netherlands.

note 3 : since the start 324 individuals caught.

note 4 : most of the adults were ringed in Delfzijl, the rest is ringed in Eemshaven.

note 5 :

Orange flag with a black two alpha-numeric code (on left tarsus).

note 1 : birds ringed in the UK, North Wales.

White ring with black 2 alpha code.

note 1 : used codes since 2009 ; since 2010 also XA-XZ , FA-FZ and LA-LR used on adults.

note 2 : this is a RAS-project in Groningen, The Netherlands.

note 3 : since the start 62 individuals caught.

note 4 : most of the adults were ringed in Delfzijl, the rest is ringed in Eemshaven.