Dewlap

Like the Spines, the Dewlap is used to make the iguana appear larger. An   iguana does something called head-bobbing                        which is used as a territorial display. When an iguana head-bobs it extends its dewlap and stands tall. A large head-bobbing male can be very intimidating.    When a predator approaches an adult iguana will extend its dewlap, laterally flatten its body and head-bob, it may even open its mouth and "hiss".

Here, Tarzan demonstrates how big he can make himself look by extending his dewlap, and standing tall.

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