Darter

The darters, anhingas, or snakebirds is a family of aquatic birds which resemble pelicans. They mainly occur in the tropics. 
There are four living species. Three of the species are common, the fourth is rarer, and listed as near-threatened by the IUCN. 
The term "snakebird" is used for any of these species: They have a long thin neck. When they swim, only the head and neck are visible. This looks like a snake. "Darter" is a term that refers to they way these birds catch fish: They impale the fish with their beak. The American darter is sometimes called "anhinga". Sometimes it is called water turkey, even though it is unrelated to the turkey.