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Anhinga anhinga
A bird of southern swamps, the Anhinga is known as the Water-Turkey for its swimming habits and broad tail, and also as the Snake-Bird for its habit of swimming with just its long head and neck sticking out of the water.
Seen along a river in Costa Rica
Yes, that is true, sometimes even the local guides can be mistaken with the IDs :(
Good thing there are experts like you to help :)
Unfortunately a lot of people who think they know birds don't actually know birds ;)
The skinny, pointed bill is a great clue that this isn't one of the cormorants :)