Deep in the rainforests of Far North Queensland, Australia, scientists have discovered a tiny spider with an unusual hunting strategy. The newly described species, nicknamed the “catapult spider,” uses a silk-powered trap that launches prey into its web at an acceleration of up to 140 times the force of gravity.
Researchers say the spider specifically targets aggressive green tree ants, pulling them into the air using a mechanism resembling a medieval siege weapon. The discovery, published in the journal Current Biology, stunned scientists and revealed one of the most specialized and powerful prey capture systems ever documented in nature.
Why do scientists call it the “catapult spider”?
The spider gets its nickname from the catapult, an ancient Roman siege engine designed to launch projectiles long distances.
The comparison is apt because the spider stores energy in specially made silk threads before suddenly releasing them to propel prey into its web, researchers say.This species belongs to the genus Propostira of the spider family, Theridiidae. Although the spider has not yet received an official scientific name, its unique hunting method immediately caught the attention of researchers.Unlike many spiders that capture a wide range of insects, the catapult spider seems to focus almost exclusively on green tree ants (Oecophylla smaragdina).
These ants are known for their aggressive behavior, powerful stings, and ability to quickly summon their mates when threatened.Most predators avoid attacking green tree ants because of the risks involved. However, the catapult spider has developed a hunting strategy that allows it to catch dangerous insects without direct contact with them.Professor Ajay Narendra of Macquarie University described the spider’s behavior as an example of extreme specialisation, noting that few spiders focus on a single type of prey.
How does a silk-powered catapult work?
The researchers observed that the spider spends hours building a complex trap. He first creates an anchor point on the vegetation or forest floor before constructing dozens of highly tensioned silk threads.These filaments are collected in a small cone-shaped structure located near the ground. Scientists think the spider may also use chemical signals to encourage ants to examine and attack the cone.When an ant bites the structure, the trap is immediately triggered.
The energy stored in the taut silk is released, plucking the ant from the surface and launching it upward into the spider’s web waiting above.
The troops involved are amazing
Using high-speed cameras, the researchers measured accelerations of up to 1,367 meters per square second, equivalent to about 140 times Earth’s gravity.By comparison, fighter pilots typically experience about 9 grams during extreme maneuvers. Trapped ants experience forces about 15 times greater than those experienced by pilots.Ants can be launched more than 30 cm into the air, an impressive distance considering the size of the prey and the spider itself.
The prey activates the trap
One of the most unusual aspects of the hunting system is that the spider does not set traps effectively.Instead, the ant triggers the same mechanism when it attacks the silk cone. This means that the spider can remain safely in place in its web while the prey effectively releases itself into captivity.Researchers say this may be the only known spider web tailored specifically to one type of prey and activated by the prey rather than the predator.
Scientists spent days documenting this behavior
The spider was first observed by biomedical researcher and spider photographer Greg Anderson. Researchers from Macquarie University, fascinated by the web’s unusual structures, launched a detailed field investigation.The team, which includes Professor Ajay Narendra and postgraduate researcher Pranav Joshi, spent 10 days and nights studying spiders near Cooktown in Queensland.
Using infrared and high-speed cameras, they recorded hunting behavior and analyzed how silk structures store and release energy.Their findings were published in the journal Current Biology under the title High-energy ballistic spider webs overcome dangerous prey’s defenses.The catapult spider provides a great example of how evolution can produce highly specialized solutions to environmental challenges.
Using the energy stored in the silk rather than direct physical force, the spider can safely capture prey that would otherwise be dangerous to attack.The researchers say this discovery also expands our understanding of biological engineering. This silk-powered spider trap demonstrates how animals can use natural materials to create sophisticated mechanical systems that rival some of the most impressive human-made devices.
