Gulls

species: 
Ring-billed Gull
scientific name: 
Larus delawarensis
notes: 

Yellow ring with a black three alpha code and a metal ring.

note 1 :

website sighting submit: 
A study of the behavior of Ring-billed Gulls
colour-ring type: 
Legring : one, coded.
colour-ring colour (of the c-ring): 
Yellow [Y]
colour-ring code (of the c-ring): 
Three alpha code (3 letters).
countries where ringed: 
North America