Shark is a member of a group of almost exclusively marine and predaceous fishes. There are about 250 species of sharks, ranging from the 2-ft (60-cm) pygmy shark to 50-ft (15-m) giants. They are found in all seas, but are most abundant in warm waters.
They have a covering of dermal denticles that protect their skin from damage and parasites and improve fluid dynamics so that it can move faster. They have several sets of replaceable teeth.
Know About Another Sea Animal