i8 LONGIPENNES : Long-winged Swimmers 



RING-BILLED GULL 



(54. Larus delawarensis) 17-19 in. 



Adult: Mantle pearly gray, like Herring Gull, but bird much 

 smaller, and bill with clean black ring near tip; legs yellowish. 

 In winter, head and neck streaked above, neck spotted on sides 

 with dusky. 



Juvenile: Back mostly pearly; much brown on closed wings; 

 head and neck streaked or spotted with brownish and under 

 parts usually barred with dusky. 



Adult stage reached in third spring. 



SHORT-BILLED GULL 



(55. Larus brachyrhynchus) 16-18 in. 



Adult: Mantle like the California; mirrors of wing-tips very 

 large; bill absurdly small, greenish yellow, unmarked. In 

 winter, head and neck clouded with brownish. (Compare with 

 Ring-bill and California.) 



First winter: Nearly solid gray; wing-tips gray-brown (no 

 black), translucent against the sky; bill mostly black. 



Plumage changes like those of the Ring-bill. Three years 

 required to reach adult stage. 



PACIFIC KITTIWAKE 



(40a. Rissa tridactyla pollicaris) 16 in. 



Summer: White, with plain light-gray mantle and black 

 wing-tips without mirrors. Bill yellow, unmarked. 



Winter: Blackish on sides and back of head, otherwise as in 

 summer. 



Immature: Black ear-patches, nape, shoulders, and tail-tip; 

 tail slightly forked; otherwise as adult. A very handsome and 

 striking plumage. 



