What are eyebrows for?

HUMANS AREN'T THE ONLY SPECIES to have eyebrows - but we are the only species to pluck them and then draw them back on again. From the bony brow ridges of chimpanzees to the feathery protuberances of long-eared owls, many species have eyebrow-like structures.

- Helen Pilcher

Similarly to humans, many of these species use their brows to help keep moisture and dirt out of their eyes. Giraffes do this, and so do chimpanzees. And, like us, some species also use their brows as a form of communication.