Sharks eyes are located on the sides of their heads to give them a wider view of their surroundings.However, they have eyes similar to cats and can see better in dark and murky waters than other fish. Scientists think sharks may be color blind.Their ears are actually located inside of their heads. Sharks have an amazing sense of hearing.Most sharks never sleep because they have to constantly pump water through their mouth over their gills to breath or they will die.You can measure the age of a shark by counting the rings on its vertebrae.
The second oldest is the frilled shark that has been around for 80 million years. The oldest known species of living shark in the goblin shark that has been around for 120 million years.Don’t worry though, these terrifying sharks have been extinct for 16 million years. The largest shark to ever live was the massive Megalodon that averaged 50 feet in length.The smallest shark is the dwarf lantern that is only grows to six inches and the largest is the whale shark that grows to a whopping 41.5 feet in length.Sharks have been living in Earth’s oceans for 450 million years.Sharks lose teeth regularly and can go through 30,000 teeth in their lifetime. An average shark has 40-45 teeth in up to seven rows.They also have really oily livers which helps them stay balanced in deeper waters. Sharks stay buoyant because of their light weight cartilage skeletons.That is because their fins are stiff and cannot be controlled by muscles.
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