More likel scorpions, the camel spider is part of an arachnid order known as the solifugae; they live in arid hot climates, including deserts from both the Northern and the Southern hemispheres. There are even some camel spider species with a more special habitat: they live in forests and in grassland. They are found almost everywhere on the North American continent except the area at the west of the Rocky Mountains; what seems even more interesting is the fact that a variety of brown recluse spiders is also found in Hawaii. In its natural habitat the species prefers rotten tree bark as the favorite place to make the nest, but it is also found in alls sorts of house corners. Among other species, trapdoor spiders have a pretty long life span from five to twenty years, and only the females make a nest, whereas males go out in the open hunting and looking for a mate. The bites of these spiders are not dangerous, though sometimes nasty symptoms may appear: itching, swelling and even pain are among the most frequently encountered. The size of the species varies from 1.5 to 4.5 centimeters for the body length; they are mono-color, dark brown usually, without any patterns at all. The only distinct element of the male funnel web spider is a swelling on the second leg and the spinnerets located at the end of the abdomen. The female funnel web spider lives very isolated, it remains in the burrow for almost its entire life; males are the ones that go out to hunt and find mates particularly in summer and autumn months. The special thing about these creatures is the way the females carry the egg sacs with them, and once the eggs hatch, the siblings remain attached to their mothers' back until they are large enough to detach and start a life on their own. Without being venomous, the wolf spider bite can cause a bit of trouble for more sensitive people. Nevertheless, there is one other element that clearly makes the recognition of the brown recluse spider possible. One identification method used by scientists consists in checking how many pairs of eyes the species has; the brown recluse spider has only three pairs of eyes, unlike most other spiders that have four.