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 7 

 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 



'^^m^^^^^ 



