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Common Loons have red eyes. One thing to remember is that loons only have red eyes during the summer. In winter, while they are in their grayish plumage,their eyes are not red but gray. The light that you see really has many colors (like a rainbow) and red is one of the first colors of the rainbow to be filtered out by water. The reason for their eyes being red during the summer might be for attracting a mate.

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15y ago

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