Sawfish Shark, You've Got Too Many Teeth Feb 22, 2017
If you were swimming and looked up and saw this, it'd be a calming sight right?
This is the 'rostrum' of a green sawfish, with teeth lining each side. However, it doesn't really function as a saw, it's something used to swipe side-to-side to stun (or kill) prey.
They're not actually sharks, but they're relatives of sharks and stingrays. And no, they don't attack people and they're an endangered species so don't worry about running into one next time you take a swim.