It's a bit of a duh, but I'm glad somebody looked.
Peregrine falcons have dark stripes below their eyes, and it turns out that the brighter the sun where the falcon hatched, the darker the stripes. This probably proves the hypothesis that the stripes help them see in sun glare.
This is the same reason football players paint stripes below their eyes, and Egyptian eye makeup strongly resembles the feather patterns on falcons...
...did the ancient Egyptians copy falcon feathering because they were smart and worked out what it was for?
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