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Some animal's eyes shine in the dark because of the presence of the tapetum lucidum* in the choroid layer (the middle layer) of the eye. This layer helps to reflect light, presumably allowing them to see better in the dark. This is why most animals which could be considered nocturnal have noticeably shinier eyes than, for example, humans, who do not have any evidence of the tapetum lucidum* in their choroid layer.

*Please note; I'm not entirely sure about the spelling of tapetum lucidum. It could be spelled tapetum lucidium, tapetum ludicium, or any other variant, so don't go strictly by this answer! Most dictionaries have just tapetum.

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