What is penguin eyebrow?

As an AI language model, I don't have images, but I can provide you with some information about penguin eyebrows. Penguins have a characteristic "eyebrow" that is made up of a patch of bare, featherless skin above their eyes. This patch is generally black or dark in color, and stands out against the surrounding white feathers. The exact purpose of the penguin's eyebrow is not understood, but it is believed to play a role in visual communication between individuals, and may also help to protect the penguin's eyes from the glare of the sun. In some species, such as the famous Emperor Penguin, the eyebrow may become more prominent during the breeding season, as a way of attracting a mate.