So named because of the female's weird abdomen, ended in a "tail" similar to that of a scorpion. When threatened, the scorpion-tailed spider arches this tail as a scorpion would. Only the female has a tail; the male looks more like an ordinary spider and is much smaller. These creatures are found in Australia and they seem to be completely harmless. They spin circular webs and are often found in colonies, although each female spider has its own web and doesn't venture into those of other females.