Sharks are a group of elasmobranch cartilaginous fishes characterized by a ribless endoskeleton, dermal denticles, five to seven gill slits on each side, and pectoral fins that are not fused to the head.. Jan 28, 2026shark, 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.
May 16, 2024sharks are often characterised as vicious killers, but in reality, they’re a diverse and endangered group of creatures that add tremendous value to marine ecosystems. 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.
Every shark belongs to the classification chondrichthyes which identifies them as cartilaginous fish, fish whose internal skeletons are comprised of flexible cartilage rather than bone. Although most shark species inhabit the seas, a few exceptions including the river shark and bull shark can swim both in freshwater and seawater. There are more than 500 species of sharks swimming in the world’s ocean.
A large, sharp-toothed and scary beast.. Jun 11, 2025sharks are ancient, diverse predators with over 500 species. With fossil records dating back 400 million years, sharks have outlived the dinosaurs and many other forms of life currently on earth.
There are more than 1,000 species of sharks and rays, with new. Common kinds of shark include the hammerhead shark, the great white shark, the tiger shark, and the mako shark. Most sharks are cold-blooded, but some, like the great white shark and the mako shark,.
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