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Geckos are lizards and they are unique among lizards in their vocalizations. Most geckos cannot blink.

They have a fixed lens within each iris that enlarges in darkness. They lack eyelids and instead have a transparent membrane, which they lick to clean.

Nocturnal species have excellent night vision; their eyes are 350 times more sensitive to light than the human eye.I never use flash and I've never had an external flash unit for a camera.

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