By Jody Bourton
Earth News reporter
Why do hammerhead sharks have such a famously strange-shaped head?
One hypothesis is that having eyes on either side of such a wide 'hammer' allows the sharks to see better.
But even this idea divides scientific opinion, as researchers argue over whether the hammerhead design makes it more or less difficult to see.
The mystery may now be solved by a study showing that a hammerhead gives sharks outstanding binocular vision and an ability to see through 360 degrees.