All animals perceive light using different forms of a pigment called retinal .

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Retinal is a key molecule involved in vision across a wide range of animals. It changes shape in response to light, triggering a series of biochemical reactions that eventually lead to visual perception. Different animals may use variations of retinal or different proteins associated with it, but the fundamental role of retinal in light perception is widespread.

All Animals Perceive Light Using Different Forms of a Pigment