I tried looking it up in the internet but I still just dont get it
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Owls can’t move their eyes, so their field of vision is extremely limited. Being able to turn their heads gives them the range of vision that they would otherwise lack due to their fixed eyeballs.
This might be an evolutionary advantage stemming from the fact that they are nocturnal. If you look to the side without moving your head, you’ll notice that you see less clearly than you do looking forward. That’s fine in the light — you mostly just need to see if there’s something moving in your periphery. But at night, the reduced quality of eyesight while looking to the side can mean you don’t see anything in your periphery at all. Turning your head and keeping your eyes straight maximizes the light that enters the eye.
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