Sydney funnel-web (Atrax robustus) With highly toxic venom produced in large amounts and large fangs to inject it, the Sydney funnel-web is without a doubt the deadliest spider in Australia and possibly the world. Found in New South Wales, in forests as well as populated urban areas, they burrow in humid sheltered places. They can wander in backyards and sometimes fall into swimming pools, and though they’re not often encountered, they can be quite aggressive when threatened. Though just 1.5 – 3.5 cm big, the Sydney funnel-web has fangs so powerful they can even pierce through nails and toenails. Their venom has a compound that can attack the human nervous system alter the functioning of all organs, and when coming from a male, can kill.