A newly found spider species in the tropical rainforests of Australia has amazed scientists with its unique hunting method that propels prey into the air using a silk trap loaded with a spring mechanism. The spider, known as the “ballista spider,” constructs a cone-shaped snare to launch green tree ants into its web, resembling the ancient Roman ballista weapon.
Researchers, led by biologist Ajay Narendra from Macquarie University in Australia, were astonished by observing this behavior firsthand. The spider, belonging to the Propostira genus, is yet to be formally named.
The initial sighting of the spider occurred in 2022 when Greg Anderson witnessed a green tree ant being flung into a web in a remote rainforest on Queensland’s Cape York Peninsula. Subsequently, a team from Macquarie University traveled to northern Queensland in 2023 to investigate further.
Using high-speed cameras, the researchers spent 10 days capturing the spiders’ unconventional hunting technique. The spiders, which are nocturnal and measure three to five millimeters in length, spend their days hidden under leaves and come out at night to construct intricate traps.
To set up their traps, the spiders descend about half a meter and attach silk tension lines to an anchor point, forming a cone structure that is designed to launch prey into the air when triggered. Green tree ants are attracted to the trap and become ensnared, leading to their launch into the spider’s main web for the final capture.
The rapid launch mechanism, occurring in approximately 42 milliseconds, exposes the ants to significant G-forces, far exceeding those experienced by jet pilots. This hunting strategy differs from that of the slingshot spider, as the ballista spider stores energy in its silk trap to launch prey with force while maintaining a safe distance.
Saad Bhamla, an associate professor at the University of Colorado-Boulder’s BioFrontiers Institute, suggests that the green tree ants’ aggressiveness and territorial behavior might play a role in how they are targeted by the spiders. Further research will focus on identifying potential pheromones in the spider silk that attract these specific ants.
The discovery of this unique hunting behavior underscores the ongoing revelations about nature in 2026, emphasizing the vast potential for further exploration and understanding of the natural world.
