Sharks are fish, but instead of bones they have cartilage. They live in oceans everywhere, from the deep sea to the shallows along the coast. So far we know of around 500 species of sharks, and they come in all kinds of sizes and shapes.
Here are a few of them:
Great White Shark: big, with the pointed teeth everyone knows it for. Whale Shark: the largest fish in the sea. The Hammerhead Shark has eyes set on the ends of its head, which looks like a hammer. Tiger Shark: known for its stripes, and it will eat almost anything. Bull Shark: aggressive, and you can find it in both rivers and oceans. Mako Shark: fast, with two types, shortfin and longfin. Blue Shark: sleek, with a blue-gray colour. Nurse shark: slow, and it likes to rest on the ocean floor. The goblin shark has an odd look and a long, flat snout. The Thresher Shark uses its long tail like a whip. The cookiecutter shark is small but known for biting much larger prey. Leopard sharks are spotted like a leopard and live in shallow seas. Angel Shark: a flat, ray-like body. Sand Tiger Shark: looks fierce, with pointed teeth sticking out. Sixgill shark: has six gills instead of the usual five. Porbeagle Shark: like a smaller Great White. Dogfish Sharks: tiny sharks that live in all sorts of places.
That is just a small handful of the many shark species out there. Researchers keep finding new ones and learning more about them.