Bullet Ant

Paraponera clavata

Bullet Ant (Paraponera clavata): Size, Sting & Pain Index

The bullet ant (Paraponera clavata) is an 18–30 mm rainforest ant with the most painful insect sting on the Schmidt pain index, rated 4+, with pain lasting up to 24 hours.

Scientific name
Paraponera clavata
Schmidt pain index
4+ (the highest)
Pain lasts
Waves for up to 24 hours
Size
18–30 mm workers
Habitat
Humid lowland rainforest
Range
Honduras to Bolivia and Brazil, up to ~750 m
Diet
Nectar and small arthropods
Colony size
Several hundred to ~2,000 workers

Why is it called a bullet ant?

Because its sting feels like being shot. People who have been stung by Paraponera clavata say the first hit is like a gunshot, and entomologist Justin O. Schmidt gave it the top score, level 4 (often written 4+), on his Schmidt sting pain index, describing "pure, intense, brilliant pain" (Natural History Museum, London). The pain then comes back in throbbing waves for up to about 24 hours (Schmidt 2019, Toxins). That long-lasting pain gives it another name: in Venezuela it is hormiga veinticuatro, the "24 ant", and in parts of Brazil it is known as tocandira. For the full story of how the sting was rated, read the Field Journal piece "Why the Bullet Ant's Sting Tops the Schmidt Pain Index", linked in the questions below and under Featured in the Field Journal. The ant itself was first described by Johan Christian Fabricius in 1775. Clavata means "club-shaped", and it is the only living species in its whole subfamily, Paraponerinae.

How bad is a bullet ant sting?

About as bad as an insect sting gets. Entomologist Justin O. Schmidt, who was stung more than 1,000 times over his career, gave the bullet ant a 4+ on his 1-to-4 sting pain index, the top score, where a honey bee is a 2. He described it as "pure, intense, brilliant pain, like walking over flaming charcoal with a three-inch nail embedded in your heel." What puts it above other level-4 stings is how long it lasts. A tarantula hawk or warrior wasp can hit just as hard at first, but bullet ant pain keeps coming in throbbing waves for roughly 12 to 24 hours, and some accounts report longer. Victims can also get trembling, sweating, swelling, a racing heart and temporary paralysis of the stung limb. The main culprit is poneratoxin, a 25-amino-acid peptide in the venom that stops sodium channels in nerve cells from switching off, so pain nerves keep firing (more in the venom section below). The Sateré-Mawé people of the Brazilian Amazon turn that pain into a coming-of-age test: young men wear leaf gloves packed with bullet ants, stingers facing in, for about 10 minutes at a time, 20 times over. The Field Journal tells the full story in "Why the Bullet Ant's Sting Tops the Schmidt Pain Index" and ranks it against nine other stings in "Most Painful Stings, Ranked" (both linked in the questions below and under Featured in the Field Journal).

Poneratoxin: what's in the venom

Much of the pain comes from poneratoxin, a small neurotoxic peptide of 25 amino acids. It acts on voltage-gated sodium channels in nerve and muscle cells and stops them from switching off normally, so nerves keep firing. In people that means long, repeated waves of pain. In insect prey it causes paralysis. Researchers have studied poneratoxin as a possible model for biological insecticides.

The Sateré-Mawé glove initiation

The Sateré-Mawé people of the Brazilian Amazon use bullet ants in an initiation rite for young men. The ants are first sedated with a plant-based solution, then woven into gloves made of leaves with their stingers facing inward. When they wake up angry, the initiate wears the gloves for about 10 minutes at a time, and has to go through the ordeal 20 times to complete the initiation. Hands and arms can go numb and shake for days afterwards.

Habitat & range

Bullet ants live in humid lowland rainforest across Central and South America, from Honduras, El Salvador and Nicaragua through Costa Rica and Panama, and south into Venezuela, Colombia, Ecuador, Peru, Bolivia and Brazil. Most records come from sea level up to about 750 m. They avoid dry forest and high mountains.

Size and appearance

Workers are 18 to 30 mm long, among the largest ants in the world. They are stout, reddish-black and look rather like a wingless wasp. The queen is only a little bigger than her workers.

Colony life & behaviour

Colonies usually hold several hundred workers, and large ones can reach a couple of thousand. Nests sit in the soil at the base of a tree. Workers climb that tree to forage, often as far as the upper canopy, and little foraging happens on the forest floor. Nectar, carried home as a drop between the mandibles, is the most common food brought back, along with small insects and other arthropods. Foragers are not especially aggressive, but the nest is defended hard. Disturbed workers squeak audibly by stridulating and sting readily. Fights between neighbouring colonies leave injured workers, and a tiny phorid fly, Apocephalus paraponerae, tracks down injured ants by scent to feed on them and lay eggs.

Conservation

The bullet ant has not been assessed by the IUCN and is widespread and common across its range. Like every rainforest species, it depends on the canopy staying intact.

The Bullet Ant in Wilder

In Wilder, the free browser collectible card game, the Bullet Ant is an Uncommon Insecta creature with Venom and Herd. Venom means combat damage it deals to another creature destroys it, a nod to the sting, while Herd rewards playing insects in numbers, the way a colony defends its nest.

Fun facts about Bullet Ant

  • Sateré-Mawé initiates wear gloves packed with live bullet ants, stingers facing inward, for about 10 minutes at a time, and must go through the ordeal 20 times.
  • Justin Schmidt said that if he ever added a level 5 to his pain index, the bullet ant would be the only insect on it.
  • Tiny phorid flies find injured bullet ant workers by smell and lay eggs on them.
  • Bullet ants nest at the base of a tree but do most of their foraging high in its canopy.
  • A fossil relative, Paraponera dieteri, is preserved in Miocene Dominican amber from Hispaniola.

Bullet Ant vs Sydney Funnel-web Spider

The Sydney Funnel-web Spider's fast-acting venom and ambush tactics give it the edge over the bullet ant's defensive sting in a forest-floor clash.

On the rainforest floor, the funnel-web spider waits in its silk-lined burrow. When the bullet ant wanders near, the spider darts out and delivers a quick bite. Its venom quickly disrupts the ant's nervous system. The bullet ant twists and stings back with its famously painful venom, but the spider's larger size and multiple legs let it maintain control. The ant's sting causes intense irritation yet fails to stop the spider's attack. Within moments the spider drags its prey into the burrow, where the ant's movements slow. The encounter ends with the spider feeding on the subdued insect.

Read more about Sydney Funnel-web Spider.

Common questions about Bullet Ant

Why is it called a bullet ant?

Because its sting feels like being shot. Justin Schmidt rated it level 4, the top of his sting pain index (NHM London), and the pain returns in waves for up to about 24 hours (Schmidt 2019). That is also why Venezuelans call it hormiga veinticuatro, the "24 ant" (Wikipedia). More in why the bullet ant tops the Schmidt pain index.

How painful is a bullet ant sting?

It is the most painful insect sting on the Schmidt pain index, rated 4+, the top of the scale. Justin Schmidt called it "pure, intense, brilliant pain", like "walking over flaming charcoal with a three-inch nail embedded in your heel" (NHM London), and the pain comes in waves for roughly 12 to 24 hours. Read why the bullet ant tops the pain index and the 10 most painful stings, ranked.

Is the bullet ant sting the most painful in the world?

Among insects, yes, mainly because it lasts so long. The tarantula hawk and warrior wasp also score 4 on Schmidt's scale and hurt just as much at first, but bullet ant pain keeps coming for hours. Schmidt has said that if he added a level 5, the bullet ant would be the only insect on it (Smithsonian). See the 10 most painful stings, ranked.

Can a bullet ant kill you?

A single sting is not known to kill a healthy person, but many stings can be dangerous. Britannica notes that multiple stings can be lethal (Britannica). One sting brings hours of pain, trembling, swelling and temporary paralysis of the stung area. Trouble breathing or a swelling face or throat after any sting needs emergency care.

Where do bullet ants live?

In humid lowland rainforests of Central and South America, from Honduras and Nicaragua south to Bolivia and Brazil, mostly below about 750 m. Colonies nest at the base of trees and workers forage up in the canopy (AntWeb).

How big is a bullet ant?

Workers are 18–30 mm long, roughly 0.7 to 1.2 inches, which makes them one of the largest ants in the world. They are stout and reddish-black and look like a wingless wasp (Wikipedia).

What is the bullet ant glove ritual?

A coming-of-age rite of the Sateré-Mawé people of the Brazilian Amazon. Bullet ants are sedated and woven into leaf gloves with their stingers facing inward, and once they wake, young men wear the gloves for about 10 minutes at a time, 20 times in all (Smithsonian). Our Field Journal piece on why the bullet ant's sting tops the pain index covers the ritual in more detail.

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