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Diving ducks and sea ducks forage deep underwater. To be able to submerge more easily, the diving ducks are heavier than dabbling ducks, and therefore have more difficulty taking off to fly.
Dabbling ducks feed on the surface of water or on land, or as deep as they can reach by up-ending without completely submerging. Along the edge of the beak there is a comb-like structure called a pecten. This strains the water squirting from the side of the beak and traps any food. The pecten is also used to preen feathers.
A few specialized species such as the smew, goosander, and the mergansers are adapted to catch and swallow large fish.
The others have the characteristic wide flat beak designed for dredging-type jobs such as pulling up waterweed, pulling worms and small molluscs out of mud, searching for insect larvae, and bulk jobs such as holding and turning headfirst and swallowing a squirming frog. To avoid injury when digging into sediment it has no cere. but the nostrils come out through hard horn.
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source: wikipedia
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Additional Photos by Daniel Draghici (dkmurphys) Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 5734 W: 83 N: 11524] (77034)
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