One of the most popular weeks of the summer is upon us: Shark Week! This is when the Discovery Channel gives us land-dwellers a glimpse into the beasts that rule the ocean. These colorblind fish can live up to 100 years old, and can grow to 6 meters long. Here are 10 amazing facts about sharks.

1. Sharks have been around for over 400 million years. And, speaking of the 400s, there are 440 different species of sharks.
2. With so many species, it makes sense that you could find a shark in every ocean in the world.
3. Sharks are made up completely of cartilage. There are no bones in their bodies, the only sharp part of them are their teeth – which they can have 30,000 of in their lifetime.
4. Tiger sharks are the ones that pose a particular threat to humans. They eat anything in their path (giving them the nickname “garbage cans of the sea”).
5. A female shark can have a pregnancy ranging from 5 months to 3.5 years. Blue sharks can have up to 135 pups at once.
6. The hammerhead is known for their, you guessed it, hammer-shaped head. The technical term for this is “cephalofoils”, and they are developed with electrical sensors, making them great hunters.
7. Females outweigh the males in many species of sharks.
8. Sharks are incredibly skilled at detecting motion.
9. They also have a great sense of hearing. They are known to detect sounds from up to a quarter-mile in distance.
10. Humans are always afraid of getting eaten by a shark while swimming in the ocean. However, the odds of getting eaten by a shark are 1 in 3,748,067.
11. As an additional fact, Jaws 3D is the greatest shark film of all time. Don’t believe me? Look here.

Sources: Buzzfeed and Discovery