Lizard Behaviour
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Lizards tend to be bright, alert and responsive. Captive-born ones will tolerate handling and appear to become tame. Wild-caught lizards are often shy, wary and try to escape at the slightest disturbance.
Defensive behaviour
Defensive behaviour is associated with territoriality, escape from potential predators or may be ritualised with reproduction or feeding. It may be exhibited with humans, conspecifics, other animals or with no stimulation.
They stand sideways to the threat, swallow air to increase their size, stand high off the ground to look bigger and lash at the threat with their tails. Some lizards may display head bobbing and push-ups or gape and threaten to bite.
Aggressive behaviour
Offensive aggression is rare and usually involves sexually mature iguana males during their breeding season from December to March in the northern hemisphere.
They may attack anything entering their territory and attempt to bite them. It is recommended that these lizards be confined to their cage during this time.
Dominance
When several lizards are housed together aggression and dominance is not always overtly physical since actual fighting may not occur. Subtle behaviour by the dominant lizard may result in the subordinate staying away from basking areas and food and slowly dying of stress-enhanced hypothermia and starvation.