12. The Final Countdown

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The top 11 "fearsome finalists" from previous episodes, including bugs, bats, spiders and snakes, battle it out for the No. 1 spot.

11. Killers: Myth or Reality

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The dive-bombing harpy eagle feeds on monkeys and wild pigs, while the maned wolf is more the victim of bad PR than an actual threat.

10. Stealth Hunters

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The Brazilian yellow scorpion is one of the species' most venomous, but a tiny, parasite-bearing snail has a much bigger and more devastating effect.

9. Are They For Real?

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The elephant seal's crushing head-butt is a killer skill, but the bites of both the Amazonian giant centipede and the vampire bat are horrifying.

8. Best Left Alone

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The murky rivers of the tropics contain a shocking surprise: the electric eel. The cute capybara and the furry llama can be surprisingly treacherous.

7. Stop! Danger Ahead

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A friendly-looking but deadly seal prowls the frigid waters off the tip of South America. The recluse spider's sting is painful, then rots away flesh.

6. One Hit Wonders

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The boa constrictor crushes the life out of its victims and the bullet ant's sting is painful, but the assassin caterpillar lives up to its name.

5. Pack Hunters

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The oceanic whitetip shark is infamous for attacking shipwreck survivors. On land, packs of feral dogs are becoming a serious threat to human life.

4. Killer or Saviours

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Creatures such as the tarantula and the Gila monster are nightmares of myth and legend -- but also a surprising treasure trove for medical science.

3. The Freaks

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Despite dwindling numbers, the Humboldt squid's beak is deadly, but the Brazilian wandering spider's fangs and venom are ruthlessly efficient.

2. Deathly Bite

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Orcas possess awesome speed, power and intelligence, but the rattlesnake, black widow spider and even the mosquito challenge them in dangerousness.

1. Jungle Jeopardy

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Its bite force and night vision make the jaguar the jungle's "killer of killers," but the fer-de-lance pit viper's flesh-rotting venom is devastating.

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