Most starfish have five arms, but some species can have up to forty. All starfish can regenerate their legs if they’re cut off. Some can generate entirely new bodies from one leg. All starfish are invertebrates.

Starfish live only in salt water environments around the world.

Starfish have primitive nerves, but no brain.They only have two senses: touch and sight. They have no blood. Instead, they use sea water to move things around inside their body.

They mainly eat mussels, clams and similar creatures.

A starfish eating a mussel.