Sharks
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A shark is an oceanic fish, streamlined in appearance and typically predatory. A shark's most notable characteristics include a prominent dorsal fin, fully replaceable teeth (with the exception of the whale shark) and a cartilaginous skeleton. Sharks can be man-eaters, but shark attacks on humans are rare and considered by shark professionals as mistakes caused by the shark's misinterpretation of the human as being its natural prey. Many species of shark are also famous for their ability to detect seemingly minute amounts of blood in water, and can follow blood trails for many miles.