Long-winged Swimmers 



generally long and forked, so that in aspect, as in flight, the birds 

 suggest their name of sea swallow. 



Marsh Tern. 



Royal Tern. 



Wilson's Te-rn, 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. 



3i 



