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Though sharks are considered apex predators, they are often eaten by humans and are sometimes eaten by killer whales. Shark embryos from different fathers will also eat each other in utero, with the largest embryo of the bunch usually winning out.


Sharks move through the water with the help of their tail fins. The body of a shark is light as it is made of cartilage and not bones. It has a perfectly streamlined body. Its dorsal fins help it steer through the water.


A great white shark, or Carcharodon carcharias, is a large shark that inhabits the coastal waters of all oceans. It is the largest macro-predatory fish on Earth.


A shark's eggs become fertilized in the female shark's body. The male shark passes sperm through extensions of the pelvic fins to fertilize the eggs and the gestation period can last up to two years.


Sharks are fish, but they belong to the group called Chondrichthyes, or cartilaginous fish, which is a different scientific group than most types of fish. Common fish, such as tuna or salmon, all belong to the group Osteichthyes. The distinction is based upon the makeup of their skeletons.


A school of sharks is referred to as a school, shiver, gam, frenzy or herd. While some species of sharks are solitary hunters, many species spend their lives in large groups.


A baby shark is referred to as a pup. Sharks are born in three different ways. Sharks lay eggs that then hatch, carry eggs that hatch inside them or grow pups inside them.


There are over 400 species of sharks currently prowling the world's oceans. The smallest shark is the dwarf lantern shark, which has a maximum length of 6.8 inches at maturity. The largest shark is the whale shark, which can reach a length of approximately 40 feet at maturity.


Shark meat is not entirely healthy, as it can contain high levels of mercury. According to a report from the United States Environmental Protection Agency in 2004, shark was classified along with tilefish, king mackerel and swordfish as containing high levels of mercury. The EPA report went on to ad


A baby shark is called a pup. A female shark can produce between one and 100 pups at a time, depending on the type of shark.