This is a good question. It has an answer that may surprise you. I too thought varanus only hiss, hence their acute hearing; however Mary Akeley, wife of great taxidermist Carl Akeley @ tun of century - she went on a trip to Africa, to bury her husband Carl ~1905. In her exploits written some 10 years later of her African trip she discussed in 1 paragraph how the water iguana (= Varanus niloticus) vocalizes, other than the customary hissing often seen.
I thought this was an isolated incident. Then some people began to ask me about water monitor (V. salvator) vocalizing - so the records increased, although slowly. Then in 1998, a paper in Hamadryad was written on the vocalization of V. salvator and other anecdotal reports on this phenomena in Varanus - apparently they do...a little discussed behavior that should be looked at with great scrutiny....
Have you 'thought' you heard your Varanus vocalize?
cheers,
markb
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