But usually its pupils are W-shaped. It also has three hearts A cuttlefish, the tentacled, colour-changing sea creature with floating, polystyrene-like centre, is a kind of child’s birthday party ...

Nature has developed some truly bizarre ways for animals to see the world around them. Some creatures have strangely shaped ...

Animal eyes may look strange, but their shapes are survival tools built by evolution. Goats use horizontal pupils to scan the ...

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With one of the largest brain-to-body size ratios of all the invertebrates, the inquisitive cuttlefish could teach us about the evolution of intelligence throughout the animal kingdom—even among ...

It's easy to think of pupils as simple holes that widen in the dark and shrink in the light. But if you look across the animal kingdom, you'll see a variety of pupil shapes: vertical slits in cats and ...

Most people have encountered squid through their local seafood menu or field trip to an aquarium. Unlike octopuses, which are named for their eight arms, squid have 10 individual appendages. They most ...