Multiple choice

Which animal sleeps with one eye open?

  1. Dolphin

  2. Camel

  3. Horse

  4. Tiger
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Dolphins use unihemispheric slow-wave sleep, meaning only one half of their brain sleeps at a time while the other half remains active. This allows them to keep one eye open to watch for predators and control their breathing, which is a conscious action for them. Camels, horses, and tigers sleep with both eyes closed.

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