I WONDER - Do Fish Have Eyelids?

Fish lack eyelids, so their eyes remain open even while sleeping. Unlike most animals, fish do not fully relax their brains during sleep, but they slow their breathing and movement. Sharks, on the other hand, have eyelids, but they do not close completely.

Why do fish keep their eyes open even when they are asleep?

• They have no eyelids.

• They are always awake.

• They are afraid of predators.

• They need to see in the dark.

How do fish sleep differently from most animals?

• They sleep with their eyes closed.

• They fully relax their brain.

• They stop breathing.

• They never fully relax their brain.

What happens to a fish's breathing when it is asleep?

• It remains the same.

• It stops completely.

• It becomes faster.

• It slows down.

Why do fish keep their brains active while sleeping?

• To find food.

• To keep swimming.

• To remember things.

• To respond to danger.

What is unique about shark eyelids compared to fish?

• They close completely.

• They are always closed.

• They do not close fully.

• They are transparent.