Gregg, you`ve done it again (good for you), are you seriously saying they don`t communicate with each other??
Communcation isn`t defined as being a spoken language (so sign language isn`t communication in your view)!?
The definition of intelligence isn`t the spoken language, nor living in a social group, though they do the latter, Gregg!
Please define "intelligence" in relation to Varanids and any other animal (particularly mammals and birds), or why you believe they don`t have much at all.
You are so lacking in knowledge (understanding), it hurts!!