KEY TO FAMILIES 121 
Order V. Anseres.—Dvucks, Grrsn, and Swans. 
Toes four; tarsus rounded not flattened as in the Grebes; tail well 
developed; bill rounded and with tooth-like projections, or flattened 
and with fluted ridges. Unlike the Grebes, most Ducks when pursued 
fly rather than dive. 
oN 
S eo 
Fig. 33, 
1. Bill, long, narrow and rounded, with tooth-like projections (Fig. 
33)... . Subfamily Merging: MERGANSERS, p. 187. 
2. Bill more or less flattened and ducklike. 
A. Lores feathered. 
a. True Ducks; tarsus shorter than the middle-toe without 
nail; scales on its front transverse more or less square 
(Fig. 34, u, b). 
at, Hind-toe without a flap or lobe (Fig. 34, a)... . Sub- 
family Anatine: Rrver Ducgs, p. 190. 
a, Hind-toe lobed (Fig. 34,6)... . Subfamily Fuliguline: 
Sea and Bay Ducks, p. 198. 
SS 
FESS 
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eae. 
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SSS 
SEXES 
Fia. 34 
6. Tarsus generally longer than middle-toe, without nail; scales 
on its front rounded. ... Subfamily Anserine: Grzsz, 
p. 210. 
: B. Lores bare... . Subfamily Cygnine: Swans, p. 215. 
