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Sighting: The group of tourists catch their first glimpse of the 30 stone male as they wade through the Rwanda undergrowth

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Stand-off: The jungle giant, joined by a younger member of its family, looks down warily as the visitors smile and take pictures

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Sulky: The male momentarily turns away, with a look that says he's not too happy

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Scarey: Suddenly, the silverback rears up and pounds his chest with his huge fists

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Snarling: Next second, the tourists reel back in terror as the gorilla launches itself at them

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Snatched: With astonishing strength, the male hauls away a man in a blue anorak

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Stepping in: A ranger waves a coat to distract the gorilla as the man scrambles away

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Safe: White-faced with shock, the hapless tourist finally makes it back to his companions