dabbling duck

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Any of various ducks, chiefly of the genus Anas, including the mallards, teals, and shovelers, that feed by dabbling in shallow water and are favored as game birds.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A duck that feeds by dabbling in shallow water including the mallard and teal.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun any of numerous shallow-water ducks that feed by upending and dabbling