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A mother zebra and her son's treacherous migration through East Africa and across the Mara River.
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Fatal shark attacks in South Africa.
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The Burmese python, one of the largest snakes in the world, becomes an invasive species in the state of Florida.
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More than 2 million wild pigs with razor-sharp tusks roam Texas, posing a serious threat to farmland and citizens.
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How grassland animals such as the American Bison survive the extreme weather and rugged conditions of the Great Plains.
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Frightening stories from fishermen and sailors suggest the mythical creature known as the kraken may be all too real.
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Extreme angler Jeremy Wade recalls his encounters with dangerous creatures from the fifth season of "River Monsters."
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