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Most people trekking through the jungle would turn tail and run a mile the opposite direction if they came face to face with a giant anaconda.
But not Niall McCann. Like a real-life Indiana Jones he decided instead to do battle with the beast - something he said was a lifetime's ambition.
The adventurer, who has rowed the Atlantic and trekked across Greenland's Polar Ice Cap, pounced on the 18ft-long jungle giant, which weighed around 100kg and had a girth of 27ins.
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Dodging snaps from its giant fangs, Mr McCann wrestled the monster to the ground and held its head until his companions were able to run to his aid.
The 29-year-old biologist from Cardiff had been exploring the tropical rainforests of Guyana when he happened across the snake on a bank of the Rewa River.
Capturing the beast fulfilled a lifetime's ambition for the brave scientist, who has a passion for handling creatures that would have most people shaking in their boots.
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He said: 'I'd always dreamed of seeing an anaconda and I knew that our work in Guyana would give us a real possibility of seeing one.
'I was trying to hold its head to the ground and it kept trying to turn its head to bite me - it was a wrestle.
'Its strength was amazing and when a ripple went through its body it shook all of us.'
source: dailymail