Terns 



63. Oull-billed Tern iQelochelidon nilotica). L. 

 14.5; T. 5,5. Ads., summer. Bill thick, short, black; 

 tail ihort, forked only i.y, crown black; above pearl} 

 below white, Ads., winter. Head white, with black 

 patch before and behind eye. Yng. Similar, but above 

 edged with buffy; head and neck streaked with gray- 

 ish. Notes. A high,;thin, somewhat reedy tes-tee-ies, 

 sometimes suggesting a weak-voiced katydid. 



Range. — Cosmopolitan; breeds in North America from Mexico to 

 Floriaa and nonh to Virginia; wanaers north rarely 10 New Bruns- 

 wick; winters from souihem Texas southward. 



73. Aleutian Tern {Slsma aleidica). L. 14. T. 

 6,7, forked ^. Ads., summer. Above aiui below pearl 

 gray, browner below; throat white; crown black; fore- 

 head white', line from .bill io eys black. AJs., winter. 

 "With rather more white on forehead." (Cat. B. M.) 

 Notes. "A tliin, cleari trilling whistle," (Nelson.) 



Range- — Alaska from Kadlalt to Bering Stroll, southwest to Jspao. 



74. Least Tern (^Sterna antillaru?>i). L. 9; T. j.J, 

 forked 1.7. Ads., summer. Hill yellow, black at tip; 

 forehead wMte; a black line, from bill to eye; crown 

 black; above pearl; below white. Ads., winter. Crown 

 white; nape black; bill dark; tail shorter. Yng. Sim- 

 ilar to last, but above witti butty or brownish. HqUs. 

 "A sharp squeak much like the cry of a very young 

 pig following its mother." 



Rane«. — Western heiiilspher*; breeds locally from northern Soutb 

 America northward to Massachusetts, Dakota, and southern CaU' 

 fornla; winters south of United States. 



76. Bridled Tern {Sterna ancethetus), L. rj. Ads. 

 Forehead and line over eye white; lores and crown 

 black; nape whitish; back sooty gray or sooty brown; 

 outer tail feathers white, except at tip; inner ones 

 grayish brown. Notes. A soft qua. 



Range.— Tropical reelons; north In Atlantic to the Bahamas; casual 



In Florida. 



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