Why are goats' pupils horizontal?

Goats are extremely important animals for lots of cultures around the world – they provide milk, meat, and even warm wool. Have you ever noticed that their eyes are unusual? Instead of round pupils like you and me, their pupils are shaped like horizontal lines. We asked vision scientist Martin Banks to explain why. 

If you’ve got an eye-opening question for Moment of Um, send it our way at BrainsOn.org/contact, and we’ll try to find the answer.