National Geographic Society

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The guanacos stamina is incredible.  At 5,000 meters (15,000 feet) - each breath contains only half the oxygen it does at sea level.  The exertion would leave most humans on their knees, gasping.  Guanacos can fight for hours.  They spit at each other as a warning shot and if that doesn't work, they cough up a green loogie that they can shoot over 6 feet.

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years. Nat Geo WILD goes head to head with the ultimate top 10 warrior males in the natural world to discover whose fights last longest.