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BLACK DUCK OR DUSKY DUCK. 



[dnas obscura Gmel. 



Under the general name ''black duck" are included 

 two species and one sub-species so closely alike that 

 only a careful comparison will distinguish them. 



They are birds similar in size and form to the mal- 

 lard, but very different in color. The black duck is 

 brownish-black or dusky, all the feathers edged with 

 pale grayish or yellowish. The head and neck are 

 streaked with yellowish. Of this there is least on the 

 top of the head and the hind neck, which are sometimes 

 nearly black; most on the sides of head and throat. 



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