Eli5 How and why do owls rotate their heads 270*

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I tried looking it up in the internet but I still just dont get it

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6 Answers

Anonymous 0 Comments

So I’m order to see as well as they do, owls’ eyes are cylindrical (unlike ours, which are spherical). This means that they can’t swivel their eyes, as there just isn’t space in the skull.

As a result, they’ve evolved to be able to turn their heads a long way.

That’s the why – as for the how, they have more neck vertebrae than we do, which allows for a greater degree of rotation.

Anonymous 0 Comments

Owls can’t move their eyeballs like us humans. They can however rotate their heads instead.

The owl’s bone structure is special. If we rotate our heads 270deg, it will lead to some damage.

Anonymous 0 Comments

Owls are head turners because their eyes can’t move.
>Owls can’t move their eyeballs. That’s because owls don’t have eyeballs at all. Instead, their eyes are shaped like tubes, held rigidly in place by bones called sclerotic rings. (Human eye sockets, which hold spherical eyes, do not have sclerotic rings.)

Anonymous 0 Comments

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.

Anonymous 0 Comments

Owls, as well as most birds, cannot move their eyes in their sockets. The only way they can look around is to turn their heads.

Many birds have their eyes on either side of their head for this reason. This gives them a very wide field of view so they don’t have to move their heads very much. Birds of prey, like owls, need to have their eyes on the front of their head in order to have binocular vision which is necessary for depth perception. As a result, most birds of prey such as eagles and owls have long, flexible necks which allow them to turn their heads very far; owls and eagles have 14 neck vertebrae compared to humans’ seven.

Owls’ necks don’t look very long, but that’s because they’re obscured by feathers. When you look at their [skeleton](https://www.owlpages.com/owls/articles/images/physiology_skeleton.jpg), you see how long their necks actually are.

Anonymous 0 Comments

On top of all these great explanations about the eyes is there also another clear advantage. If the owl has to remain total silent while looking for prey, would any movement of the owl give it away, so by keeping totally still and only turn it’s head, does it not make any sound.