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We saw only females. The males are solid black and usually seen on the river. See my photo gallery: Anhinga – Anhinga anhinga. Every river and lake in Costa Rica has Anhinga’s on both slopes. Often called “Snake Bird” because after they dive into the water to catch a fish, they swim back to shore with only the long neck above water, appearing as a swimming snake. 🙂
The Anhinga, sometimes called “Snake Bird” because when swimming with his long neck out of the water he/she looks like a snake swimming. This bird is found in all of the tropical Americas on the water where it dives into the water to catch a fish and then afterwards sun-dries itself on a tree as in these two photos, one a male (all black) and one a female (with brown neck). See more of my photos from Costa Rica in the Anhinga Gallery (linked) with most seen on rivers, though also on lakes.
And yes, this makes three days that I have reverted back to my Tortuguero trip for photos. That is because I’ve had some “lean” days in my garden recently (doing posts a week or more ahead now) and I always have more that can be shared from places like Tortuguero! 🙂 Every national park and wildlife reserve here is a rich source of nature photos!
¡Pura Vida!