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. …

Nov 19, 2024 · Sharks are cartilaginous fish with diverse shapes, sizes, and diets, inhabiting all oceans and playing crucial roles in marine ecosystems.

SRI conducts and sponsors rigorous, peer-reviewed field research about sharks and uses science-based information to educate and advocate for shark conservation policies and protections by the …

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.

Dec 7, 2025 · There are more than 530 living species of sharks, taxonomically grouped into 14–30 families, according to different authorities. Several larger species can be dangerous to humans.

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

Jan 21, 2025 · Discover interesting facts about where sharks live, how big they can get, and how likely it is to get bitten by one.

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.