I don't know why she swallowed the fly. Perhaps she'll die. With rhymes like these, it is no wonder that many people view spiders with apprehension. There are about 2,000 kinds of spiders in the United States. Of these, only a few species are considered to have bites that are of medical importance.
Spiders are very shy creatures.
Most people get bitten because they are cleaning an area that has not been cleaned for a long time and they disturb a spider's web or nest. Spiders are often blamed for many more bites than they actually commit. In general, most spider bites will not harm most people except for slight discomfort for a limited time after being bitten. A few individuals may be hypersensitive to the bites of a particular species, but this allergic reaction won't be known until after the person gets bitten. Although only a few spiders are toxic or cause allergic reactions, if one has been bitten, it can be important to save the spider for identification purposes.