Varanids have five, or six senses that are nearly as good if not better than humans - not that people are the quota to measure everything from - but their eye-sight, sense of smell, hearing, sense of vibrations, with perhaps their sense of taste less than humans or even dogs - they do have taste buds, with V. exanthematicus having the most primitive types there-of...damn mammal-like aren't they!
They might be reacting to the habits you exhibit and know that when the snake cages are finished, you're goin to interupt them, and they don't like it! Could that be it?
cheers,
markb
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