Sharks are cartilaginous fish ranging in size from 17 cm (the Dwarf Lanternshark) to the Whale Shark, the largest fish in the sea, who measures 12 m in length. Sharks can be traced back 420 million years. They favour a salt-water environment, although some species have been found in freshwater. Sharks replace their teeth continuously throughout their life. These grow in rows in their jaw, pushing forward like a conveyor belt. Nearly every species is carnivorous, and some are noted for being voracious predators. A few species feed on plankton.
This fellow is a Great White Shark, probably the most famous species.
Other species in this blog: