ANATID:: DUCKS, GEESE, SWANS 
- Geese are usually seen flying high overhead in V-shaped flocks 
led by an old gander at the apex ; they are larger than ducks and 
never dive when feeding. 
The Ducks are divided into three groups: Mergansers, which dive 
for their food, wear conspicuous crests and “have narrow, toothed 
bills ; Sea Ducks, which dive for their food and have large, broad 
bills; Azver and Pond Ducks, which do not dive, but dip their 
body when feeding. Many of the ducks have a bright patch on 
the wing, called the sfecudum. The females are generally smaller 
than the males and less conspicuously marked, 
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