Anhinga's are quite common and an interesting species that are long-necked, long-tailed swimmer frequently seen perched above the water with its wings half-spread to dry since the lack the oil of most water birds allowing them to swim underwater longer and farther than most other water birds.
They for fish while swimming underwater or at surface mostly waiting for fish to come near then impaling them with a thrust of their long, pointed bill. Their neck is specially adapted for this kind of rapid thrust. The speared fish is then tossed in air, then swallowed headfirst. The can vary their buoyancy in water and are often seen swimming with only head and neck above water which is why they are sometimes referred to as snake birds. They are silent at most times, but around nesting colonies they make various croaking and clicking sounds.