Owls can’t move their eyeballs! Their eyeballs are fixed on their head, so they are stuck there. That is why owls evolved a way to turn their heads almost all the way around. That helps the see what is behind them and what is to the side of them without moving their eyes!
Check out the Spectacular Science episode about owls on YouTube by clicking the following link: youtu.be/Soka18tU6g4