LETTER XX. 



135 



among the wave-worn cliffs. The habits 



of the two species seem to be 



very similar, and I am 



not aware of any reason 



for their thus selecting 



these separate localities. 



At a distance the Black 

 Cormorant is easily dis- 

 tinguished by the marked 

 white patches on the 

 cheeks and thighs, which 

 contrast very conspicuously with the rest of its black plumage. 

 The Green Cormorant, on the contrary, has no break in the 



