diving duck

noun
any of numerous ducks, common in coastal bays and river mouths, that typically dive from the water's surface for their food (contrasted with dabbling duck ).

Origin:
1805–15

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World English Dictionary
diving duck
 
n
any of various ducks, such as the pochard, scaup, redhead, and canvasback, that inhabit bays, estuaries, lakes, etc, and can dive and swim beneath the surface of the water

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Each diving duck species appears to fill a unique foraging niche, although
  there is much overlap of selected prey.
Northern pintail, mallards, and a variety of diving duck species follow shortly
  thereafter.
Northern pintails, mallards, and a variety of diving duck species follow
  shortly thereafter.
So this diving duck can stay underwater longer in search of fish food.
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