Sharks existed before dinosaurs and have lived on Earth for over 400 million years.
Some sharks can detect a drop of blood in vast amounts of water.
Sharks do not have bones — their skeletons are made entirely of cartilage.
Certain shark species glow in the dark due to bioluminescence.
A shark can lose thousands of teeth in its lifetime and continuously grow new ones.
Whale sharks are the largest fish in the world, yet they mainly eat tiny plankton.
Sharks have special electroreceptors that help them sense movements and heartbeats underwater.