What is an "eyestripe"?

An eyestripe, also known as an eye line or eye stripe, is a distinct line or stripe that extends from the eye of certain animals, such as birds or mammals. It typically runs horizontally or diagonally across the face, passing through or adjacent to the eye. The eyestripe can vary in color, width, and prominence among different species. It often serves as a visual characteristic, aiding in species identification, communication, or camouflage. The eyestripe can play a role in attracting mates, signaling aggression or dominance, or providing protection by disrupting the visibility of the eye.