n. 斑头秋沙鸭

[ noun ]
smallest merganser and most expert diver; found in northern Eurasia
<noun.animal>

Smew \Smew\, n. [Perhaps for ice-mew.] (Zo["o]l.)
(a) small European merganser ({Mergus albellus}) which has a
white crest; -- called also {smee}, {smee duck}, {white
merganser}, and {white nun}.
(b) The hooded merganser. [Local, U.S.]