Iguana GuideQuick answer: Iguanas can hiss during defensive or confrontational situations. Treat it as a signal to reassess distance and the rest of the animal's body language.
An audible signal
Animal Diversity Web lists hissing among the communication behaviors documented in green iguanas.
What usually matters
A hiss is more informative when combined with orientation, mouth position, dewlap display, body elevation or tail movement.
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Avoid escalation
For a captive iguana, increasing pressure after a defensive signal can turn communication into physical defense. Giving space is generally the safer response.
Not a diagnosis
A change in vocal or respiratory sound that is not clearly tied to an interaction may have a medical cause and belongs with a reptile veterinarian.
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Keep exploring
Use the related guides to connect this topic with species, behavior, anatomy and habitat rather than treating it as an isolated fact.
Sources & further reading
Key factual claims on this page were checked against these references.
Health boundary: Iguana Guide explains natural history and responsible ownership. It does not diagnose illness or provide treatment instructions.