They tend to get quite tame around humans, especially if fed. They teach me a lot about the parts of our behaviour which are controlled by the upper brain stem. There's something very dinosaur-ish about them; I'd like them a lot less if they were big enough to see me as food.
Gekkos are rather cool too. I love their little chirping noises at night.
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I've seen that green lizard in Death in Paradise - wouldn't mind having one as a semi-wild pet.