Vocalization

The Double-crested Cormorant that I saw on first trip on shark river estuary  makes deep, guttural grunts that sound a bit like an oinking pig. They grunt when taking off or landing, or during mating or aggressive displays, but otherwise are generally silent.  The sound is like tup tup tup ki ki ki ki.

http://www.youtube.com/watch?v=ZYN2yK6OB_g

Anhinga

Anhinga’s call is a raspy croaking. Its calls consist of clicks, croaks and grunts. A series of rapid clicks that sound mechanical, like a sewing machine.the sound is like kiii kii kiirrr kiii kii kiirrr. It usually calls near or on the nest, or during the flight or while perching. Usually, Anhinga is a quiet bird.

http://soundbible.com/899-Anhinga.html