20 



LOOXS. 



iial mifrr.'itions in Sep. and Oct. Returns 

 north in April. 



F]^. 18. 



lied-ibroated Loon in wioter dress, ••steamboatino:*'. 1-6. 



5. RED-THROATED LOON 



Smallest of our Loons, 26. Differs from 

 the Loon in being decidedly lighter in color, 

 especially on head and neck. In summer it 

 has triangular red patch on the throat, and 

 this is sometimes (though rarely) retained in 

 autumn. In winter the white of the throat 

 extends up on the sides of the head to the 



