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 Hybrids between mallards and black ducks sometimes have partially green heads with the plumage of the black duck except for speculums similar to the mallard. Puddle ducks, also known as dabblers, are in a group that tips up the tail when stretching down to feed. They have large, powerful wings for vertical take-off, and their legs are positioned near the center of the body for easier movement on land. 
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