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These come mainly from the Americas. They spend a lot of their lives living in trees.
They are herbivores and not aggressive unless frightened. When threatened iguanas don't give up easy though, they raze their heads, open their jaws, their crest stands up and they use their long tails to frighten their attacker by whipping them.
Iguanas have three eyes two normal and one ( parietal eye) on top center part of the skull which looks like a blister, this lets their brain know whether it is day or night also allows to see shadows above. This eye works like a clock, the light effects chemicals in the brain instructing the body when to sleep.It is also thaught this enables them to see shadows overhead.
More to come.....