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Bookmark or Share- Shark | Attacks, Types, & Facts | BritannicaShark, any of numerous species of cartilaginous fishes that make up the order Selachii (class Chondrichthyes). Most species have a tough skin that is dull gray in color and roughened by toothlike scales. The mouth contains sharp triangular teeth. Sharks lack a swim bladder and must swim to keep from sinking.
- Shark Species — Shark Research InstituteMost sharks in this order live tropical coastal waters. With an estimated 126 different species, this order of sharks is found in nearly every marine habitat. These sharks have long snouts with a short mouth, five (5) gill slits, two (2) dorsal fins and lack an anal fin. Some deepwater Squaliformes are bioluminescent.
- Shark - WikipediaSelect examples include the tiger shark, blue shark, great white shark, mako shark, thresher shark, and hammerhead shark. Sharks are caught by humans for shark meat or shark fin soup . Many shark populations are threatened by human activities.
- Sharks Facts and Information | SeaWorld Parks & EntertainmentSharks live all over the world, from warm, tropical lagoons to polar seas. Some even inhabit freshwater lakes and rivers! Sharks are fishes. Like other fishes, sharks are cold-blooded, have fins, live in the water, and breathe with gills. A shark's skeleton is made of cartilage.
- Sharks: Facts about the ocean's apex predators | Live ScienceSharks are a diverse group of often-misunderstood fish. Learn more about these predators, including their evolution, habitat, diet and behavior.
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