Long-winged Swimmers 



generally long and forked, so that in aspect, as in flight, the bii'ds 

 suggest their name of sea swallow. 



Marsh Tern. 



Royal Tern. 



Wilson's Tern, or Common Tern, 



Roseate Tern. 



Arctic Tern. 



Least Tern. 



Black Tern. 



Skimmers 



(Family Rynchopidce) 



Only one species of skimmer inhabits the Western Hemi- 

 sphere. These birds have extraordinary bills, thin, and resembling 

 the blade of a knife, with lower half much longer than the upper 

 mandible, and used to skim food from the surface of the water 

 and to open shells. Wings exceedingly long; flight more meas- 

 ured and sweeping than a tern's. 



Black Skimmer, or Scissor Bill. 



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