Interesting fact:

There are so many reasons to be fascinated by sharks. Did you know that they have no bones? Whilst they use their gills to filter oxygen from the water, they are a special type of fish known as "elasmobranch". This just means that they are a fish made out of cartilaginous tissues—the stuff that your ears and nose tip are made of. This fish category also includes rays, sawfish, and skates.