No spiders are known to feed directly on vertebrate blood, but Evarcha culicivora, a jumping spider (Salticidae) from East Africa, preys frequently on blood-carrying mosquitoes in the field (1).

Web Removal While these webs are unsightly, some homeowners keep them around because webs catch insects such as mosquitoes. That's a good thing, right? Yes, and no. Sure, webs can catch mosquitoes, but it isn't such a good idea to let webs sit.

spider'sdiet consists mainly of mosquitoes, flies, moths, and sometimes even other spiders. So, despite the fear that these eight-legged predators can induce in humans, they're beneficial creatures to have around since they can help prevent other pesky insects from invading your home.

Spiders help control pests Although spiders themselves are considered pests, they actually control other pests. Spiders feed on insects, which helps to regulate the population of harmful bugs. Their presence is highly beneficial to farms and gardens. As a result, many people appreciate having spiders on their property.