Peregrine falcons have dark stripes under their eyes, thought to reduce sun glare. But in other falcon species these markings are unrelated to sunlight.

Following is a transcript of your video. Why do football players wear black stripes under their eyes? It's a phenomenon called "eye black." Natural skin absorbs some light, but reflects the rest.

When Carter took the field against the Fighting Irish in the Orange Bowl, he was wearing black tape under his eyes and across the bridge of his nose, with writing that simply said: “DARTH VADER.” ...

This idea may also sound familiar to sports fans. Athletes in baseball and American football often smear dark stripes, known as "eye black", under their eyes to enhance their vision in bright ...