Spider Bites Though most people fear spider bites because of the nasty symptoms associated with them, sometimes there is nothing to worry about, as a small skin wound is no threat for one's health. Not all spider bites are dangerous, since the majority of spider species are totally harmless for humans; with the exception of a few venomous ones, the rest are pretty safe. The favorite pray of trapdoor spiders includes grasshoppers, moths, crickets, but they don't back off when it comes to having small birds and scorpions for their meals too. The size of trapdoor spiders is not larger than three centimeters for the body, with the females clearly dominating the males in this respect. Nevertheless, the red color helps the males too in order to send the same threatening message as the female. While the males move freely in their habitat, the females usually spend their entire lives in just one place, as they very seldom leave their nests. In terms of toxicity, the black widow spider has one of the most potent venoms in the animal world: it is actually fifteen times stronger than that of the rattlesnake for instance. Warmth and humidity make the perfect habitat for the funnel web spider, nevertheless, they also suffer from heavy rains that destroy their burrows. In the aftermath of such events, the funnel web spider redoubles its level of activity so as to get its life back on track. 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 wolf spider is not an aggressive species, though it may bite if provoked or threatened. Their bite is not very serious, there will be mild and bearable pain and itching, and local swelling occasionally. Though some of the wolf spider varieties like the Australian and the South American ones were thought to create necroses, recent studies have proved this to be a false myth. In geographical areas where poisonous spiders are known to live, people often learn how to differentiate them from the non-toxic species that are frequently encountered around the house. Very seldom would one take a photo or a drawing of a poisonous spider and try to compare it with a specimen identified in open air.