96 The Official Guide to the 
for the most part on fresh water, and restricted to 
vegetable diet ; others frequenting the sea, where they 
subsist on marine organisms obtained by diving. 
They may be roughly divided into surface-feeding and 
diving Ducks. ‘The first genus, Dendrocygna, inhabits 
Asia, Africa, the West Indies, South America, and 
Australia; they are fresh-water species, generally 
known as “‘ Whistling” or Tree Ducks. One beautiful 
example is Eyton’s Tree Duck, an Australian species ; 
another striking bird is the White-faced or Widow- 
cap Duck, D. widuata, a native of South America. 
Tadorna, the type of which is our Sheld Duck, a very 
handsome species, is represented by Z. vadjah from 
Cape York; and Casarca, the Ruddy Sheld Ducks, 
by a New Zealand species, C. varviegata. ‘There are 
also Carolina Ducks, very lovely birds, and Teals. 
Case XXII. 
The Diving Ducks are represented by specimens of 
Steller’s Duck, a beautiful Arctic species, a Norfolk- 
killed example of which is in the collection of British 
Birds ; the Australian White-eyed Duck, /Vyvoca aus- 
tralis, Eunetta falcata, and £. formosa, the Baikal 
Teal; and Catrina moschata, the Muscovy Duck, a 
South American species domesticated here. SAizzura 
Jobata, a singular Australian species, ornamented with 
a large caruncle hanging from the lower mandible ~ 
like the wattle of a cock ; and Lvismatura leucocephala, 
the Spiney-tailed Duck, a southern species of a genus 
which ranges from Eastern Europe to the West Indies, 
Chili, the Auckland Islands, S. Africa, and Australia, 
A small case will be noticed containing two singular 
birds, JVettapus coromandelicus, the Pigmy Goose, 
already mentioned on p. 95, and the Freckled Duck 
(Zadorna navosa), | | 
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