94 AUSTRALIAN BIRD MAPS 



MAP 43 



Distribution of: 

 River Ducks. 

 Spiny-tailed Ducks. 

 Sea Duck. 

 Shieldrakes. 



a. White-headed Shieldrake (Burdekin Duck) 



(Tadorna). 



b. Chestnut-breasted Shieldrake (Mountain 



Duck (Casarca). 



Blue-billed Duck (Erismatura) \ Spine-tailed 



Musk Duck (Biziura) J Ducks. 



c. Eight species of river ducks all over Aus- 



tralia. 



One species of sea duck {Nyroca). 



