47 Underwater Discoveries That Will Make You Think Twice Before Getting Into Water

Rock

If you ever find a piece of rock in the lake, there are a lot of chances you would just throw the piece of rock back thinking it to be just a random rock. But actually, it is Pharyngeal teeth, which was found by a kid. This piece is composed of the hard movable plates. A lot of fishes use pharyngeal teeth to crush the external skeleton (which is also called exoskeleton) of their prey.