This bird has bigger eyes than brains

An ostrich's eye is bigger than its brain. Its eyes are five times bigger than the human eye and bigger than that of any land animal. As the largest bird it could look like a very tasty meal for predators so the ostrich has a small head on a long neck so it can take in a large view of the surroundings just in case something is trying to sneak up on it. To help it see as much as it can ostriches have evolved the largest eye of any land mammal - 5cm in diameter. Regarding their brain, in evolution it must have been more successful to have a bigger eye than a bigger brain, therefore all the ostriches which had slightly larger eyes (therefore better eyesight) must have been better at not being eaten, so could survive to pass on their genes to their babies. The size of a skull decides how large a brain can be, so if you give up more space for a big eye in your skull then there is less space for the brain.