A spider's bite can kill insects and other small animals. A few kinds of spiders are harmful to human beings. Four of the Widow females are known to bite humans. The bites of these six spiders often cause mild reactions. Usually a person iritates a spider several times for it to bite you.
Spiders are helpful to people because they eat harmful insects.
They eat grasshopper and locusts which destroy crops. Spiders also eat flies and mosquitoes which carry diseases. Spiders feed mostly on insects but some capture and eat tadpoles, small frogs, small fish and mice. Most females are larger and stronger than the males and occasionally they eat males. Spiders can live anywhere they can find food like fields, woods, swamps, caves and deserts.