LONGIPENNES: Long-winged Swimmers 



LONGIPENNES (long wings) are aquatic; wings long with 

 great surface compared with body weight; consequently they 

 are strong, though not especially swift, fliers; feet webbed, but 

 weak; bill stout, more or less hooked in those of the scavenger 

 habit (Gulls and Jaegers), comparatively slender and straight 

 in the fish-catchers (Terns); mainly white-bodied with darker 

 back and wings; distributed over nearly the whole earth, except 

 the South Pacific Ocean. 



PARASITIC JAEGER 



(37. Stercorarius parasiticus) 17-19 in. 



Light phase: Brownish slaty above, with darker cap and 

 yellowish collar; under parts white. 



Dark phase: Entirely sooty brown, paler below. 



Immatures: Brownish above, white below, with broken, 

 dusky barring on fore parts. 



On the wing appears gull-like, but flight more direct and 

 swifter. A parasite in its feeding-habits, it drives small Gulls 

 and Terns until they disgorge, catching the prize in air. 



LONG-TAILED JAEGER See Appendix. 



(38. Stercorarius longicaudus) 20 in. 



FAMILY GULLS, etc. 

 HEERMANN GULL 



(57. Lams heermanni) 16-18 in. 



Adult: Head white, body all dark (slaty); wings and tail black, 

 tail white-tipped. Bill red. In fall, head is brown and gray- 

 streaked, white head being acquired in January. 



First winter: Sooty brown with black wings and tail. 



Adult plumage acquired in the third winter. 



The only dark-bodied Gull. Very clannish in habit. Feeds 

 mostly on beach. An habitual robber of Pelicans. 



