The world’s most painful insect sting - Justin Schmidt

1,854,787 views ・ 2021-04-19

TED-Ed


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00:06
Welcome to It Hurts!
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One of these creatures is thought to possess
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the world’s most painful insect sting.
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If you were to guess, would it be:
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the ant that forages in rainforest canopies?
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The bee that protects a hive of delectable honey?
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Or the wasp that paralyzes tarantulas?
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Let’s find out!
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Ant, bee, and wasp venoms contain a variable cocktail of compounds
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designed to incite unsavory sensations and even compromise bodily functions.
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Entomologist Justin O. Schmidt’s sting pain index
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describes and ranks the pain of around 100 kinds of insect stings.
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One of our three competitors claims the nastiest one.
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First, let’s consider the Western honeybee’s sting,
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Schmidt says it’s like “a flaming match head has landed on your arm
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and is quenched first with lye and then sulfuric acid.”
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This discomfort is accomplished with venom
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that’s packed with a pain-causing peptide called “melittin”
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and flesh-softening enzymes that disperse the venom.
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These enzymes may also cause allergic reactions
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and even lead to fluid buildup in the lungs.
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Because worker honeybees have barbed stingers that burrow into certain victims,
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they usually can't sting without leaving part of their bodies behind,
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which ultimately kills them.
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Since only the queen bee has the ability to reproduce,
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a worker bee’s self-sacrifice helps ensure that the colony— and their genes—
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will prevail.
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But before they go,
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they release an alarm pheromone that activates a mass attack
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and often targets some of the most vulnerable sites on their victim’s body.
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The tarantula hawk wasp sting is, as Schmidt says,
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“blinding, fierce, shockingly electric ... A bolt out of the heavens.
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Lie down and scream.”
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The sensation might last just 5 agonizing minutes for humans,
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but it leaves tarantulas— the wasp’s preferred target— permanently paralyzed.
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After the wasp stings a tarantula, aiming for a crucial bundle of nerves,
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it lays an egg on the immobilized spider.
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Once hatched, the wasp’s larva spends its formative days
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in the bountiful environment of the tarantula’s body—
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devouring it alive.
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Aside from paralyzing the tarantula,
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the wasp’s sting doesn’t seem to do further harm.
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This functions to preserve the spider as fresh meat for the wasp’s offspring.
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03:01
The rainforest-dwelling bullet ant’s sting yields
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“pure, intense, brilliant pain.
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Like walking over a flaming bed of charcoal
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with a 3-inch nail embedded in your heel,” according to Schmidt.
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And this torture often lasts more than 12 hours.
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A neurotoxic peptide called poneratoxin
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that our bodies struggle to degrade is what makes the pain last so long.
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In addition to agony, poneratoxin can induce trembling, cold sweats,
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nausea, vomiting, and even an abnormal heartbeat.
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The bullet ant is, in fact, crowned with the most painful insect sting.
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It's thought that they may have evolved such an excruciating defense
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because they forage in rainforest canopies loaded with predators
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looking for proteinaceous snacks.
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They can’t simply jump or fly away,
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so perhaps they’re better off with this reliable, rather off-putting weapon.
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The tarantula hawk wasp’s formidable sting
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clocks in as the second most painful on the scale.
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And it’s likely the reason this wasp has no known predators.
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Honeybee stings are in the middle of the pain scale.
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But when many sting simultaneously,
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what might’ve felt manageable at first becomes all the more dangerous.
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In fact, insect stings helped enable the evolution of complex colonies
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that would otherwise represent an easy feast to predators.
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Some stinging insects are, of course, more aggressive than others,
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but most of the time, they only sting us when we provoke them.
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The truth hurts.
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