There is a fact too ... Out of 4,675 known lizard species, only a few vocalize. The gecko is one. A female's harsh warning call threatens. The male's mating call sounds either like a bird's melody or chirps.
Some iguanas verbalize a harsh, guttural hiss, says Melissa Kaplan author of Iguanas for Dummies.
The male veiled chameleon produces a low, barely audible sound an ethereal hoot, says Kenneth E. Barnett, who recorded the sound with the help of biologist professor Reginald B. Cocroft, now at the University of Missouri-Columbia.