An ostrich’s brain size is smaller than its eyeball. Talk about a bird’s brain. The average size of an ostrich’s brain is 59.26 x 42.30 mm, meaning the ostrich’s brain is smaller than either of its eyes which are the size of billiard balls.
100 Mind-Blowing Eyeball Facts
You can see an owl’s eyeball through its ear. One of the useless facts you’ll want to unsee: The unusually large ear opening of a northern saw-whet owl lets you have a disturbing view of its eyeball.