Species
of spiders that build webs create many varieties of patterns, but the construction
principles are very similar.
The
spider releases a sticky thread that is strong enough to span large distances
in resistance to wind and flying insects and particles. It also releases an
oily substance through its skin to avoid sticking to the web.
First,
one strand which is carried by the wind to another point on an object. The spider
then walks back and forth on that strand, reinforcing and adding radial additions.
The rest of the pattern is up to the spider.
Some
live in the webs and some use it exclusively to catch unsuspecting prey. The
sticky silk is also used to envelop the insects, making it easier to kill.