What sound does a black caiman sound like?

First, it is a reptile, not a mammal. The caiman makes grunts and hisses.

It is a very dangerous reptile that eats little people in Colombia.

When I was a Peace Corps volunteer in Colombia in 1963, a native taught me how to make a sound to call the caimans. There was a pond in the central plaza of Neiva, Colombia where they had several caimans and he demonstrated. There was an amazing response!

The sound he taught me is a guttural "swallowing" kind of sound, made with mouth closed, like you would imagine a frog would make.

I would love to attach a file of the sound. I have tested this in several zoos and it never fails to attract caimans, even under water, much to onlooker's amazement.