tl;dr: Researchers in North Queensland have discovered a new spider (genus Propostira), nicknamed the "ballista spider," that builds a spring-loaded silk snare specifically to catch green tree ants one at a time. The spider constructs a cone of 15–60 tensioned silk lines near the ground, likely baited with a pheromone; when an ant bites the cone, it detaches and catapults the ant upward at over 1,300 m/s² into the spider's web. The silk reportedly has greater instantaneous power density than any other known biological catapult.