WONDER #1213: Do Fish Sleep with Their Eyes Open?
Question 1 of 3
Why do fish have to sleep with their eyes open?
- to protect from predators
- to keep an eye out for food
- lack of eyelids
- to watch their children
Question 2 of 3
Most fish keep moving while sleeping to keep water flowing over their gills to make sure their bodies have enough of what?
Question 3 of 3
Which fish secretes a jelly-like “sleeping bag” made of mucus before it rests?
- parrot fish
Check your answers online at https://wonderopolis.org/wonder/Do-Fish-Sleep-with-Their-Eyes-Open.