CHECK LIST OF NEW YORK BIRDS 20$ 



17 (40) Kittiwake 



Rissa tridactyla (Linn.) 



18 (42) Glaucous gull 



Larus glaucus Briinn. 



19 (43) Iceland gull 



Larus leucopterus Faber 



20 (47) Great black-backed gull 

 Larus marinus Linn. 



