Some fish, amphibians and reptiles have a simple third eye on top of the head. This patch of light-sensitive cells doesn’t add much to their vision, but it helps some animals to regulate their body temperature and navigate via the Sun’s light.

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Invertebrates often have more than two eyes. Most spiders, for example, have eight eyes that help them spot and hunt prey.

A group of marine molluscs called chitons do even better – they have hundreds of eyes dotted all over the armoured plates that cover their bodies. This boosts their field of view and helps them detect predators.

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Authors

Helen Pilcher
Helen PilcherScience writer, presenter and performer.

Helen Pilcher is a tea-drinking, biscuit-nibbling science and comedy writer, with a PhD in cell biology.

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