DiCaprio goes to extremes for frontier epic 'The Revenant'

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For Inarritu, DiCaprio was the best person to play Hugh Glass, a real life fur trapper who survived a bear mauling, and then went to find his mates who left him for dead in the unforgiving wildernessAlejandro G. Inarritu knew Leonardo DiCaprio would go to the ends of the earth to make the 19th century survival epic "The Revenant" the way the famously meticulous director wanted.

For Inarritu, DiCaprio was the best person to play Hugh Glass, a real life fur trapper who survived a bear mauling, and then went to find his mates who left him for dead in the unforgiving wilderness. 

Over the course of the nearly yearlong production, the Oscar-nominated actor and environmentalist proved his commitment over and over. He ate raw bison. He stripped naked in sub-zero temperatures. He even jumped into an icy river. But, early on, Inarritu had one very specific worry: Could DiCaprio grow a beard?

"You cannot shoot this film with a fake beard. It would look terrible," Inarritu said in a recent interview. "Not every man grows so much hair in his face. That was a bet."

Thankfully for the director, DiCaprio sprouted a gnarly, unruly beard that becomes a symbol of where exactly his character is on his journey and how deeply he's devolved. Makeup added dirt on a daily basis, and a combination of glycerin and grit to his hair to get that unwashed, bloody look of someone who'd survived a bear attack.

It's a minor thing, and perhaps the easiest test DiCaprio had to endure to make the sprawling epic, but it's one of those details that illustrate the overall production's commitment to authenticity.

"It's a really primal story of man and the natural world," said DiCaprio in a recent phone interview. "It's almost biblical."

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