While it is common for you to dislike or fear spiders, they should not be killed when they are in your home.
One benefit of having spiders in your home is their tendency to capture pesky pests and disease-carrying insects such as mosquitoes.
Instead of killing the spiders you find, make an effort to free them outdoors.
I know it can be hard to convince you, but let me try: don't kill the next spider you see in your house.
Why? Because spiders are an important part of nature and our inner ecosystem, as well as being other organisms in their own right.
People like to think that their homes are safely isolated from the outside world, but many types of spiders can be found indoors. Some were accidentally caught, while others are short-term visitors. Some species even enjoy the great indoors, where they live their lives happily and make more spiders. These arachnids are usually secretive, and almost everyone you come across is not aggressive or dangerous. And they can provide services like eating pests, some even eat other spiders.
My colleagues and I conducted a visual survey of 50 North Carolina homes to inventory the arthropods that live under our roofs. Every house we visited was home to many spiders. The most common species we encountered were cobweb spiders and cellar spiders.
They both build nets where they lie waiting for the prey to be caught. Cellar spiders sometimes leave their webs to hunt other spiders in their territory, mimicking prey to catch their cousins for dinner.
Although they are generalist predators, apt to eat anything they can catch, spiders regularly catch annoying pests and even disease-carrying insects, for example mosquitoes. There is even a species of jumping spider that prefers to eat blood-filled mosquitoes in African homes. So killing a spider not only costs the arachnid its life, but it can also drive a major predator out of your home.
It is natural to fear spiders
They have many legs, hideous faces, and most are poisonous, although most species have too weak a venom to cause problems in humans, if their fangs can pierce our skin. Even entomologists themselves can fall prey to arachnophobia. I know of some spider researchers who overcame their fear by observing and working with these fascinating creatures. If they can do it, you can too!
Spiders aren't trying to catch you, and they actually prefer to avoid humans
We are much more dangerous to them than vice versa. Spider bites are extremely rare. Although there are some medically important species such as widow and recluse spiders, even their bites are rare and rarely cause serious problems.
If you really can't stand that spider in your house, apartment, garage, or wherever, instead of squashing it, try to catch it and release it outside. You will find another place to go, and both parties will be happier with the result.
But if you can handle it, it's okay to have spiders in your home. In fact, it is normal. And frankly, even if you don't see them, they will still be there. So consider a live-and-let-live approach for the next spider you find.
Matt Bertone, The Conversation
Original article (in English)