Feb 23, 2026 · Shark, 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 …

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. …

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There are more than 500 species of sharks swimming in the world’s ocean. Yet when most people think of these cartilaginous fish, a single image comes to mind: a large, sharp-toothed and scary beast. …

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.

An annotated and illustrated catalogue of shark species known to date. by Leonard J.V. Compagno, Ph.D., the world’s foremost expert on sharks and Director of our Board of Trustees.

Oct 2, 2025 · Sharks range in size from the gentle giant whale shark — which can reach up to 18.8 meters (61.7 feet) long — to the dwarf lantern shark, which is tiny enough to cradle in the palm of …

Jun 11, 2025 · Sharks are ancient, diverse predators with over 500 species. They're vital to ocean health—but slow to reproduce and threatened by overfishing.

May 17, 2024 · Sharks 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. Despite having a …

There are over 400 shark species worldwide. Learn how WWF protects sharks from threats like overfishing and habitat loss.