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  • [music playing]

  • NARRATOR: There are far deadlier creatures

  • lurking in the undergrowth, as I discovered when

  • I was out looking for firewood.

  • This tree right here is a perfect one.

  • See this bark?

  • It's like paper, and it just peels off just like that.

  • The bark of this birch tree is waterproof and flammable,

  • which means it'll burn, even in the rain.

  • [suspenseful music playing]

  • Whoa.

  • Look at that.

  • [suspenseful music playing]

  • I did not even see that there.

  • [suspenseful music playing]

  • Look at the colors on it, and look

  • at how it matches this lichen.

  • It's so well camouflaged.

  • But this beautiful snake is also a deadly one.

  • [suspenseful music playing]

  • They have infrared sensing pits.

  • It's a kind of sense that humans don't have, but pit vipers do.

  • This stealth predator can detect its prey even

  • in complete darkness, and it's armed to the teeth.

  • Look at those things right there.

  • They have hinging, venomous, hypodermic needles.

  • And those hypodermic needles, those fangs,

  • are hooked up to venom sacs in the back of its head.

  • And that venom is likely to be some of the most powerful

  • in the world.

  • I need to be incredibly cautious.

  • This snake is certainly capable of delivering

  • an extremely venomous bite, one that could even kill me.

  • It's kind of twisting up here.

  • I'm starting to push my luck, so I'm going to release

  • it carefully and retreat.

  • [suspenseful music playing]

[music playing]

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