[zrobotics]

That gives them total rotation angle of slightly over 360 degrees.

For a mechanical example, consider a common rc servo. They are specced as 180 degree, but from their normal center they can only rotate 90 degrees in either direction. Doesn't matter, they are still capable of 180 degrees of revolution.

So, your parent comment was correct, owls can rotate their heads through 1 full revolution. If they could rotate their heads one revolution either direction, then they could rotate their heads 720 degrees.