What does the appearance of red in the gecko's mouth usually indicate to an observer?

Answer

The observer has crossed the line from observation to intrusion

Seeing the flash of red in the mouth signals that the gecko's camouflage has failed, the threat display was ignored, and the observer has moved past observation into intrusion, warranting a retreat.

What does the appearance of red in the gecko's mouth usually indicate to an observer?

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Satanic Leaf-Tailed Gecko - Animal of the Week - YouTube

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