Mystery of Owls' Rotating Necks Solved

When humans attempt sudden and violent twists of their neck they risk damaging the lining of their blood vessels, which can result in a fatal blockage or stroke.

But owls are able to do so safely because of unique aspects of their bone structure and circulatory system which evolved to cope with their unusually large heads, scientists claim.

A study published in the Science journal found that blood vessels at the base of owls' heads are able to balloon outwards when blood flow increases.

This enables them to create "reservoirs" of blood which are needed to supply the animals' out-of-proportion heads and eyes while their heads are turned, researchers explained.

Source: Mystery of owls' rotating necks solved - Telegraph