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Chameleons' Coiled Nerves Enable Unique Eye Movement

11/12/2025

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Summary

Story summary

A study published in Scientific Reports finds chameleons have coiled optic nerves that allow independent eye movement and coordinated targeting.
The nerves resemble old telephone cords, providing slack for nearly 360-degree eye rotation.
Three chameleon species showed the optic nerves lengthen and coil during embryonic development.
The adaptation distinguishes chameleons from other reptiles, which manage eye movement differently.
Scientists plan to test whether similar adaptations exist in other tree-dwelling lizards.

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Story summary

A study published in Scientific Reports finds chameleons have coiled optic nerves that allow independent eye movement and coordinated targeting.
The nerves resemble old telephone cords, providing slack for nearly 360-degree eye rotation.
Three chameleon species showed the optic nerves lengthen and coil during embryonic development.
The adaptation distinguishes chameleons from other reptiles, which manage eye movement differently.
Scientists plan to test whether similar adaptations exist in other tree-dwelling lizards.