Australian Spider Catapults Ants at 140 G-Forces

A spider in Australia just rewrote the rules of hunting with a technique so wild it sounds like science fiction.

Professor Ajay Narendra from Macquarie University in Sydney and his team discovered a spider that doesn't just catch prey in its web. It catapults them using a spring-loaded silk trap that launches ants at 140 times the force of gravity.

The ballista spider, as researchers nicknamed it after a medieval Roman weapon, targets some of Australia's most aggressive insects: green tree ants. Most spiders avoid ants entirely because they're dangerous and travel in large colonies, but this species evolved a solution that's equal parts engineering and ingenuity.

Here's how it works. The spider spends three to four hours building its web high off the ground, then constructs a cone-shaped structure on a nearby leaf using tension lines made entirely of silk. It ties down the cone tightly like a compressed spring, then adds an outer layer of silk that mysteriously attracts only green tree ants.

When an ant touches the trap, it gets stuck to the sticky silk and immediately dislodges the cone. The stored tension releases instantly, propelling the ant backward through the air at 1,360 meters per second squared.

Using high-speed cameras, Narendra's team calculated the acceleration. Those 140 G's are over five times what trained fighter pilots can handle and double the force of surface-to-air missiles. Every launch they observed resulted in a successful catch.

Remarkably, the ants survive the impact despite the crushing force. They remain trapped in the main web until the spider decides to eat them.

Why This Inspires

This discovery opens fascinating questions for science. Researchers want to understand how these spiders engineered such precise tension mechanics using only silk, and how the ants survive forces that would incapacitate humans.

The spiders belong to the Propostira genus and are newly documented in Australia. They've never been observed hunting this way before anywhere in the world.

Narendra says the study is still in early stages, but practical applications could emerge from understanding both the spider's trap mechanics and the ant's ability to withstand extreme acceleration. Nature has spent millions of years perfecting solutions that human engineers are only beginning to imagine.

Sometimes the most incredible innovations are happening right above our heads on a leaf.