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Shark

Sharks are a group (superorder Selachimorpha) of fish, with a full cartilaginous skeleton and a streamlined body plan.

Sharks have keen olfactory senses, with some species able to detect as little as one part per million of blood in seawater.

In general, sharks swim at an average speed of five miles (8.25 kilometers) per hour, but when feeding or attacking, the average shark will reach speeds upwards of twelve miles (19.25 kilometers) per hour.

Note: This article excerpts material from the Wikipedia article "Shark", which is released under the GNU Free Documentation License.

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last updated on 2014-10-25 at 8:37 am EDT

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Bull Sharks

Bull Sharks

National Geographic (Jan. 20, 2012) — National Geographic biologist Mike Heithaus travels to the shallow coastal waters of the Florida Keys, where the bull shark makes its home and unsuspecting beachgoers frolic. Heithaus investigates the shark’s feeding habits using Crittercamฎ.
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