darter

n. perch, freshwater fish; web-footed bird; someone or something that moves swiftly

The darters or snake-birds are birds in the family Anhingidae. There are four living species, one of which is near-threatened. The darters are frequently referred to as “snake-birds” because of their long thin neck, which gives a snake-like appearance when they swim with their bodies submerged. The darters are large birds with dimorphic plumage. The males have black and dark brown plumage, an erectile crest on the nape and a larger bill than the female. The females have a much paler plumage especially on the neck and underparts. Both have grey stippling on long scapulars and upper wing coverts. The sharply pointed bill has serrated edges. The darters have completely webbed feet, and their legs are short and set far back on the body. Their plumage is somewhat permeable, like that of cormorants, and they spread their wings to dry after diving. Vocalizations include a clicking or rattling when flying or perching. During breeding adults sometimes have caw or hissing calls.
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Noun
1. fish-eating bird of warm inland waters having a long flexible neck and slender sharp-pointed bill
(synonym) snakebird, anhinga
(hypernym) pelecaniform seabird
(hyponym) water turkey, Anhinga anhinga
(member-holonym) genus Anhinga
2. a person or other animal that moves abruptly and rapidly; "squirrels are darters"
(hypernym) animal, animate being, beast, brute, creature, fauna
(derivation) dart

(n.)
The snakebird, a water bird of the genus Plotus; -- so called because it darts out its long, snakelike neck at its prey. See Snakebird.
  

(n.)
One who darts, or who throw darts; that which darts.
  

(n.)
A small fresh-water etheostomoid fish. The group includes numerous genera and species, all of them American. See Etheostomoid.
  

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