Where does this come from, and can I check it?

Each eyeball measures about five centimetres across. The figure is taken from Britannica, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.

Is this really a animals fact?

Yes. It sits on the Animals shelf, one of 2,600 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.

What else can I read about it?

The links under the fact point to a quiz, game, puzzle or calculator on the same subject, and the shelf below shows related facts. The wording here is original, and quoted phrases are marked as quotations.

Mondo Knows Facts

An ostrich eye is bigger than its brain

Each eyeball measures about five centimetres across The eyes take up a large share of the head and give excellent long range vision for spotting predators. Ostriches run at around 70 kilometres an hour and can maintain speed for long stretches. They are the largest living birds. It sits in Mondo's animals collection, one of 200 facts that each trace back to the reference below.

Where this comes from

Britannica

Facts that can change over time are reviewed and updated. If something here looks wrong, Mondo would rather know than be confidently incorrect.

Go further

Nature & Animals trivia

More facts like this

An ostrich eye is larger than its brainOstrich eyes measure five centimetres across, the largest of any land animal.Giant squid have eyes the size of dinner platesMeasuring up to 27 centimetres across, giant squid eyes spot bioluminescent glow.Box jellyfish possess 24 eyes, including six with true lensesComplex eye clusters located on body corners sense light and shadows.A cheetah can accelerate faster than many sports carsA cheetah can reach 60 miles per hour from rest in about three seconds.The peregrine falcon is the fastest creature on EarthIn its high-speed hunting stoop, the falcon can exceed 300 kilometres per hour.A peregrine falcon stoops faster than 300 kilometres an hourMeasured dives exceed 380 kilometres an hour in level flight trials

Tags: ostriches, eyes, speed

An ostrich eye is bigger than its brain: the short answers

Where does this come from, and can I check it?: Each eyeball measures about five centimetres across. The figure is taken from Britannica, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.
Is this really a animals fact?: Yes. It sits on the Animals shelf, one of 2,600 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.
What else can I read about it?: The links under the fact point to a quiz, game, puzzle or calculator on the same subject, and the shelf below shows related facts. The wording here is original, and quoted phrases are marked as quotations.