The fifth limb
Did you know the Emerald Tree Monitor is one of the few Varanus species to actually use its tail as an extra limb? I thought it kind of obvious, but there I was wrong.
For the Varanus it is a nice treat after some 60 million years of evolutionary promotion. Btw. the tail is 2/3 of its total length. It uses its tail 100% in trees, prefering mangroves, rain forests, or even palm or cacao plantations.

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I also didn't know that using the tail was not very common.