Sharks: Shark

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 toothlike scales. The mouth contains sharp triangular teeth. Sharks lack a swim bladder and must swim to keep from sinking. 10 Amazing Sharks You Never Knew Existed A sawshark is a distinct looking shark named for its long saw-like snout. Leopard sharks are so named for their dark saddle-shaped spots along their back and fins. The dark grey or black patterning on an otherwise silver body resembles a similar spotting to that of a leopard. Blue sharks live in open water and are very migratory. They can be found in almost all parts of the ocean, with a huge range. Sharks are some of the most intriguing and often ... Learn about sharks , their evolution, diversity, ecology, and threats. Explore the different types of sharks , from the largest to the smallest, and discover their fascinating features and behaviors. Facts about many sharks from the eight orders of sharks from the Shark Research Institute (SRI). 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 world’s governing bodies, including CITES.