26 AUKS, MURRES, PUFFINS, ETC. 



with the head all around black in summer, 

 and with the throat white in winter, fig. 17. 

 The Razor-bill also has a white wing band. 



Fig. 17. 



Razor-billed Auk in winter dress. 1-8. 



In regard to the habit of cocking up its 

 tail, it will be well to remember that the Rud- 

 dy Duck, which usually carries its tail in the 

 same way, does not always do so in windy 

 weather, and the Auk may follow its example. 

 Unless the tail is always carried upright the 

 young Razor-bills the first winter will be dif- 

 ficult to tell from Brunnich Murres as then 

 the bill is comparatively slender, nearly as 

 much so as in the Murre. 



