Humans have also found spider silk useful, and it has been used in the manufacture of bandages and rifle scope crosshairs. Spiders are often extremely abundant in terms of their populations. Most all spiders are considered beneficial to humans because they help people by controlling unwanted pests. Spiders also produce silk for products such as bandages, bullet-proof vests, and telescope crosshairs. A few spiders have aesthetic and entertainment value.
Some spiders are harmful to humans because they hurt people or domestic animals.
For example, spiders may annoy and injure man and other animals by biting. Because of people's activities and destruction of spider habitats, some spiders have become rare, threatened or endangered. Several tarantulas are now threatened with extinction. Spiders are not without natural enemies, and frogs, toads, lizards, birds, shrews, mice, beetles, parasitic flies, wasps, centipedes, and even other spiders prey upon spiders.