1. Sharks have been around for over 400 million years

That means they predate dinosaurs! Sharks are believed to have descended from a type of fish called acanthodians, which had both bony and cartilaginous elements in their skeletons.

2. Sharks come in all shapes and sizes

The largest shark is the whale shark, which can grow to be over 60 feet long. The smallest is the dwarf lanternshark, which is only about 6 inches long.

3. Sharks have amazing senses

They can smell one drop of blood in a million drops of water from up to a kilometer away. And they can sense the electrical fields emitted by other animals, which is how they're able to find their prey.

4. Sharks are vital to the health of the ocean

As apex predators, sharks play an important role in maintaining the balance of marine ecosystems. By preying on the sick and weak, they help to keep populations of other animals healthy.

5. Sharks are in danger

Sharks are being killed at an alarming rate, largely due to the demand for their fins. As a result, many shark populations are in decline. We need to do what we can to protect these amazing creatures.