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The wet and dry seasons of Thailand create the perfect environment for the giant snakehead, a voracious, odd-looking fish that can travel on land.

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Charged with venom that can produce strange and deadly results, the Brazilian wandering spider is a not a species to tangle with.

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Many grisly deaths have occurred along a river in South Africa. Is it possible they are the work of a monstrous, man-eating crocodile?

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For centuries, there have been fantastic accounts of a massive snake capable of killing sharks. Meet the species that inspired the legends.

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Megalania is a lizard the size of a whale, not seen for thousands of years. But some think the species might be tucked away in remote microclimates.

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Unusual sightings spark a search for the eastern cougar, a species thought to have become extinct in the early 20th century.

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The gray wolf is a species familiar to man, but these highly adaptive and expressive social animals remain an endless source of fascination.

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The jaguar figured largely in ancient Mayan culture, but the species survived where the Mayans did not. How are these animals faring today?

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