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Sharks are a group of elasmobranch fish characterized by a cartilaginous skeleton, five to seven gill slits on the sides of the head, and pectoral fins that are not fused to the head. Modern sharks are classified within the clade Selachimorpha (or Selachii) and are the sister group to the Batoidea ( rays and kin).
Sharks can rouse fear and awe like no other creature in the sea. Find out about the world's biggest and fastest sharks, how sharks reproduce, and how some species are at risk of extinction.
1 day ago · shark, any of numerous species of cartilaginous fishes of predatory habit that constitute the order Selachii (class Chondrichthyes ). Sharks, together with rays and skates, make up the subclass Elasmobranchii of the Chondrichthyes.
There are over 400 shark species. Learn about sharks, as well as the threats this species faces, what WWF is doing to protect its future, and how you can help.
Jun 13, 2005 · Read on for more surprising shark facts compiled by National Geographic News: • Each year there are about 50 to 70 confirmed shark attacks and 5 to 15 shark-attack fatalities around the...
Jul 4, 2022 · Sharks are a diverse group of mostly predatory fish, including the largest living fish, with skeletons made of cartilage. They have plied the seas since before the dinosaurs lived and play...
The great white shark is the world's largest known predatory fish. It has 300 teeth, yet does not chew its food. Sharks rip their prey into mouth-sized pieces which are swallowed whole.
