Sharks

Feared by most, loved my some and hunted by many, sharks are one of the most mysterious groups of creatures roaming the Earth today. Defined as a fish with a full cartilaginous skeleton and a sleek, streamlined body, a shark can range in size from the two foot pygmy shark, to the colossal 50-foot whale shark. There are more than 250 different species of sharks currently identified, making it one of the most diverse animal genera on the planet. Sharks are found in every major body of saltwater in the world, but are more common in warmer waters. There are a small number of shark species that do thrive in fresh water, and certain sharks have been known to venture from their saltwater homes to major freshwater lakes and rivers. Most members of the Shark family are predatory, though some are more ferocious than others. Ironically, the largest of the shark species, the whale shark and basking shark, are virtually harmless plankton eaters. Sharks have an extraordinary sense of smell when it comes to hunting prey, and have been known to be able to sense visually undetectable amounts of animal blood dispersed into the water from considerable distances.
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Watch Very '80s Footage of 'Shark Lady' Eugenie Clark at Work
Eugenie Clark in Pisces VI
February 27th, 2015
This week, ocean explorers mourned the loss of a legend in their field: Eugenie Clark, a marine biologist and authority on sharks.
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Birth of Jaws: Tiny Fish May Be Ancient Ancestor
fish fossil comparison
January 12th, 2015
The remains of a 415-million-year-old fish skull from Siberia — though miniscule in size — offer hints about the origins of all jawed vertebrates, ranging from reptiles to humans, a new study finds.
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Great White Sharks Are Late Bloomers
A great white shark cruises underwater in search of prey.
February 19th, 2015
Great white sharks may have an even more delayed adolescence than humans, not reaching sexual maturity until they are in their second and third decades, new research shows.
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In Photos: Ancient Fish Skull From Siberia
Fish fossil skull size
January 12th, 2015
When researchers first looked at a tiny fish skull from 415 million years ago, they classified it as a bony fish. But a new, high-tech look at the fossil shows that it's much more.
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Solved: When Earth's Largest Shark Disappeared
Megalodon Fighting Titanoboa
October 22nd, 2014
A new study of fossil records estimates that the 60-foot-long (18 meters) Megalodon shark went extinct 2.6 million years ago.
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Ghoulish Photos: Creepy, Freaky Creatures That Are (Mostly) Harmless
An aye-aye in Madagascar.
October 6th, 2014
From the alien-looking and toothy lamprey to the ghoulish aye-aye with its spindly middle finger to the beady-eyed whip spider, here are some of the creepiest-looking and fear-inducing creatures on the planet that you should pet or adore more than leap fr
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Freaky Shark 'Out of a Horror Movie' Caught by Fisherman
Frilled shark
January 22nd, 2015
A bizarre, freaky-looking shark with rows of needle-sharp teeth and a body like an eel's was caught by a fisherman in Australia. The odd creature is a rare type of shark known as a frilled shark, and is sometimes called a fish "fossil" because it dates ba
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Ancient Finned Predator Feasted on Sharks
Illustration of Dimetrodon Battle
October 22nd, 2014
During the early Permian, carnivores greatly outnumbered herbivores on land, so top predator Dimetrodon supplemented its diet by hunting sharks.
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