Season 1

1. Jungle Jeopardy

2017-12-05 · 44m

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.

2. Deathly Bite

2017-12-05 · 46m

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

3. The Freaks

2017-12-05 · 46m

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

4. Killer or Saviours

2017-12-05 · 42m

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

5. Pack Hunters

2017-12-05 · 44m

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

6. One Hit Wonders

2017-12-05 · 43m

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.

7. Stop! Danger Ahead

2017-12-05 · 46m

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.

8. Best Left Alone

2017-12-05 · 41m

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

9. Are They For Real?

2017-12-05 · 46m

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.

10. Stealth Hunters

2017-12-05 · 43m

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.

11. Killers: Myth or Reality

2017-12-05 · 45m

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

12. The Final Countdown

2017-12-05 · 43m

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