What unique feature characterizes the eyes of the Sphaerodactylus parthenopion?
Answer
Round pupils and a lack of eyelids
The Sphaerodactylus parthenopion possesses eyes that lack movable eyelids entirely, having instead a transparent protective membrane covering the eyeball. To keep this membrane clean and moist, the gecko uses its tongue to lick it. Additionally, the pupils are round rather than vertical, which suggests an adaptation for better visual acuity during daylight and twilight hours compared to purely nocturnal species.
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