Little Tern

Green ring with a white three alpha-numeric code : starting letter "I". 

note 1 : birds ringed at two sites on the Irish East coast (all pulli so far, no adults) :
1)  Kilcoole, County Wicklow with the darvic on left tarsus (and national metal on right).
2)  Baltray, County Louth with the darvic on the right tarsus (and metal left)

note 2 : 

Green ring with a white three alpha code : starting letter "I". 

note 1 : birds ringed at two sites on the Irish East coast (all pulli so far, no adults) :
1)  Kilcoole, County Wicklow with the darvic on left tarsus (and national metal on right).
2)  Baltray, County Louth with the darvic on the right tarsus (and metal left)

note 2 : 

White ring with a black three alpha-numeric code : starting letter 'P'.

note 1 :

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

note 1 : used first letters are : "X", "Z" , "U", "P", "S" and "T".

note 2 : birds ringed at various sites in the UK, may also include Isle of Man depending on demand.

note 3 : usde codes for "S" : SA1 - SZ9.

note 4 : used codes for "S" : S00 - S99 and S0A - S9Z.

note 5 :  

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

note 1 : codes starting with "A"

note 2 : birds ringed on Isle of Man, UK.

note 3 :

Colour-dyed and legrings (dark-green over yellow) on right tarsus.

note 1 : some 200 ad. birds have been dyed in spring '97. 

note 2 : scheme no longer active but birds with these rings are still occasionally seen.

Combination of rings (red over green) (on right leg) and metal ring (on left leg).

note 1: this study hopes to monitor the breeding population of the colony of terns which breeds on the Chesil Beach in West Dorset, UK. The scheme started in 1999. After tree years of failure, during 2010 again some birds were ringed.

Single orange or yellow ring (on either tarsus) and metal ring (on other leg).

note 1 : birds ringed in Norfolk, England.

Single striped ring (on either tarsus) and metal ring (on other leg).

note 1 : birds ringed in Norfolk, England up until 2008

note 2 : combination of stripes determines year of ringing : Orange/brown striped ring (on right leg) and BTO-Metal ring (on left leg).
chicks/birds ringed in 2007 : Orange/black striped ring (on leg) and metal ring (on right leg).
in 2006 the c-ring was put on the left leg for adults (5 birds ringed) and on the right leg for pulli (195 birds ringed).

Yellow/black striped ring (on left leg) and metal ring (on right leg).
in 2004 8 adults were ringed, no chicks were ringed.

Orange/light-blue striped ring (on right leg) and metal ring (on left leg).
during 2001, 149 chicks have been ringed at Gt Yarmouth, Norfolk, England.

Orange/white stripe (on left leg) ; BTO metal ring (on right leg).
9 adults ringed in 2005.

Orange/white stripe (on right leg) ; BTO metal ring (on left leg).
 

Combination of :
​* c-ring and a metal ring (on right tarsus)
​* 2 c-rings (left tarsus).

note 1 : ringed birds are adult.

note 2 : yellow, white, black, green and light-blue.

note 3 :