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. Thus, you may find brown widow spider specimens in a variety of colors from light tan to dark brown; moreover, all sorts of markings decorate their bodies making them all the more unique. There are red, orange, yellow, black and white patterns that the brown widow spider may carry on the abdomen, all of these features misleading any untrained eye. The black widow spider is not capable of killing a bird that would eat it, but the digestive sickness that would follow, will be definitely enough to make it avoid attacking the black widow again. The female black widow spider is more venomous than the male, and it is she the biggest threat to predators. The exaggerations related to camel spiders are explained by their large size, but what most people don't know is that they are not actually spiders, but a different type of arachnids more like the scorpions actually. They have no venom, and they simply kill their prey by cutting it, which, as a matter of fact, makes them less dangerous than many spiders and scorpions. The next thirty six hours are crucial for the evolution of the condition, since it is now that a deterioration or an improvement may occur; generally speaking, the ulcer and the necrosis will only appear within a few days if the health status does not improve. Once the venom has got into the system, there is a whole range of symptoms that accompany the brown recluse spider bite: vomiting, nausea, fever and muscular or joint pain have been among the most frequently reported. Far from being seen as a threat to humans, the huntsman spider is pretty useful since it mainly feeds on insects. Nevertheless, the Australian variety of the species has been reported to inflict serious bites that cause not just pain and inflammation, but vomiting episodes, fever, headaches and even changes in the heart rate.