

I supposed they don't sense a thing at their tail.. here some excerpt from Wikipedia:
Green iguanas possess a row of spines along their backs and along their tails which helps to protect them from predators. Their whiplike tails can be used to deliver painful strikes and like many other lizards, when grabbed by the tail, the iguana can allow it to break, so it can escape and eventually regrow a new one. In addition, iguanas have well developed dewlaps which helps regulate their body temperature. It is also used in courtships and displays.
So after all it's not feeling painful - phew! :D
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