Not trying to scare you and if you are arachnophobic you may be afraid to look at spider information as it may contain images. There are numerous species that may build burrows. Some of them are funnel web spiders. It is a bit like my Bull Ants. One simply needs to take care. http://www.csiro.au/resources/Funnel...der-Facts.html http://www.australianmuseum.net.au/F...-Spiders-Group http://www.funnelwebspider.net.au/sy...eb_spiders.htm I have numerous spiders. Trapdoors, Mouse spiders, Wolf spiders by the million and I'm more wary of my Bull Ants. Probably because I have felt their sting. From the Australian Museum pages: Funnel-webs burrow in moist, cool, sheltered habitats - under rocks, in and under rotting logs, crevices, rot and borer holes in rough-barked trees. In gardens, they prefer rockeries and dense shrubberies, and are rarely found in more open situations like lawns. The most characteristic sign of a Funnel-web's burrow is the irregular silk trip-lines that radiate out from the burrow entrance of most species. These trip-lines alert the spider to possible prey, mates or danger.