Did You Know?
Walleyes are known for their marble-like eyes, which let them see well in dim light. Their retinas have a layer of reflective pigment, called the tapetum lucidum, that intensifies any light the eye receives. (It’s the same membrane that causes a cat’s eyes to glow yellow.) But the sauger, the walleye’s close relative, has even better night vision because the tapetum covers a much larger portion of its retinas.
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