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As more and more of Washington state is developed, cougars struggle to survive on the outskirts of human society.
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You've got to strike a delicate balance when you're a leopard lugging prey two times your own weight up a tree.
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Leopards like to be left alone. Unless of course, it's mating season.
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They are coming closer and closer to where we live, Alien Big Cat. No one knows what they are exactly but they are killing live stock and attacking people. Animal X Natural Mystery Unit investigates.
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The cheetahs are having problems with keeping their prey, while the camera crew are having problems refining their filming techniques in this fascinating clip.
Watch more Big Cat videos with BBC Worldwide here: http://www.youtube.c om/view_play_list?p= EAFDD5D64FC52AE8