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 …

Oct 19, 2025 · 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 …

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.

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 …

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.

Jan 21, 2025 · Sharks are found in every ocean on Earth, in habitats ranging from within coral reefs to under Arctic ice. Species like the glowing kitefin shark even live in the ocean's deep …

Sep 8, 2021 · There are over 400 shark species worldwide. Learn how WWF protects sharks from threats like overfishing and habitat loss.

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 …

Sharks, a species that has existed for more than 400 million years, exist throughout our world's ocean with more than 450 species of shark in total. Most sharks are apex predators and sit at …

Sharks and their relatives have been swimming in Earth’s oceans for about 450 million years. That's long before there were humans, dinosaurs, or even trees! Sharks Are Fishes, Not …