They do this thanks to a series of adaptations in the structure of the neck, which allow these animals to rotate their heads at an angle of 270 ° without suffering damage. In addition to possessing the joints suitable for these movements, in fact, owls and owls have also undergone several changes to the structure of the vertebral artery, as recently discovered by a team at the Johns Hopkins University School of Medicine in Baltimore, Maryland. The vessel in question, in addition to being inserted into the neck higher than it does in the other birds (thus allowing the artery to have more "play"), is connected to the carotid artery by smaller vessels.
Blood. In this way, even if the connection between the vertebral artery and the skull is interrupted by an extreme rotation of the neck, the direct blood flow to the brain never undergoes those interruptions that would be harmful, if not lethal, to the animal.
The silent masters of the night: owls, tawny owls, owls and barn owls GO TO GALLERY (N photos)