NATATORES. 
This brings us to the 6th and last Natural Order, we find birds 
divided into. These are swimming birds, which have well webbed 
feet, and legs having a backward position on the body, with plumage 
thick and close, feathers impervious to water, being impregnated 
with an oily substance, which helps to keep the skin of body dry, 
in spite of their general aquatic habits. 
These birds are divided into two main groups like Grallatores 
according to their state at birth. 
(1) A (Autophagous) young capable of looking atter themselves, 
and follow parent at birth. 
I Anetide—Ducks. 
Il. Meraitores—Loons and Grebes. 
Ill. Vagatores—Gulls and Petrels. 
(2) B (Heterophagous) young requiring special care and attention 
of the parents. 
IV. Piscatores—Cormorants and Pelicans. 
V. Urinatores-—Auks and Penguins. 
TRIBE LAMELLIROSTRES. 
I Grour A—ANATIDAL (Ducks) 
Comprise of the following Families :— 
I PHCNICOPTERIDA ... Flamingos. 
I’ CYGNIDAY 2. ... Swans, long necks, legs 
short. 
Il. ANSERID... ... Geese etc. (legs more 
forward than last). 
IV SANATIDA .... Ducks (legs short and 
placed far back. 
V. MERGIDA .. Mergansers, bill toothed. 
