Dedicated group for sharks

Sharks are fishes and most have the typical fusiform body shape. Like other fishes, sharks are ectothermic (cold-blooded), live in water, have fins, and breathe with gills. However, sharks differ from Osteichthyes fish. One difference is that a shark's skeleton is made of cartilage instead of bone. Another visible difference is that bony fish tend to have a single gill slit, whereas all but two species of shark have 5 gill slits.
Male: External claspers located on the far underside of the body – forward of the caudal fin – distinguish males

The largest shark is the 13.7 m (45 ft) whale shark. The 22 to 25 cm (8.7 to 9.8 in.) midwater shark and pygmy ribbontail catshark are among the smallest.

The characteristic teeth of each species are adapted to that particular species' diet. The teeth may be serrated or smooth. Most are used for seizing prey, cutting, or crushing. Some sharks are probably not very picky about what they eat. But certain kinds of sharks eat some foods more than others. For example, hammerhead sharks eat mostly stingrays. Tiger sharks eat sea turtles. And whale sharks eat plankton.

Depends on the species: oviparous (egg laying), viviparous (live birth), and ovoviviparous ("egg live birth")

Because sharks grow slowly and have a low reproductive rate, scientists believe that sharks are relatively long-lived. As of yet, there is no accurate way to determine the age and lifespan of a shark.

Sharks live all over the world, from warm, tropical lagoons to polar seas. Some even inhabit freshwater lakes and rivers.(Mainly Niger)