<< Household Ecosystem
Spiders may give some of us the creeps, but we derive some benefit from their presence. Every spider is a predator, and they survive off what they can capture and kill -- and the prefer the insects that fly and crawl around our house. However, they are rarely a danger to us, and would prefer to keep to themselves. If not provoked, spiders rarely bite humans.
The most obvious indications of spiders are the webs hanging from the ceiling, strung between pieces of furniture, or floating above heating vents. Different types of webs indicate different types of spiders.
Among the web builders, spiders are classified by the type of web they construct, ranging from symmetric orb webs to messy cob webs. But even if you can't find any webs, you may still have spiders.
Every spider can produce silk, but some spiders never build a web. They usually roam the floors, walls, and hidden areas of our houses looking for insects to feed upon. A common spider in Oregon that doesn't use a web is the wolf spider, which usually prefers the outdoors -- until cold winter nights drive them into our homes.
Inside our modern houses, central heating systems reduce the humidity in the air, creating a desert-like climate. Spiders can go longer without water than humans, but they still need water to survive. Ocassionaly, they will look for water in places like the bathroom sink or shower. When they can't find enough water, they can also consume their own webs, taking the moisture from the strands of silk. Spiders have become very resourceful in surviving the great indoors.
Over the last several thousand years, many species of spiders have adapted to a life with us. They can usually find plenty to eat and drink, and they have countless predator-free hiding places along the ceilings, doorways, and dark corners of our homes. >>