These diverging threads would acquire an unexpected value. Passing worms or primitive insects would trip over them, causing them to pluck at the silk mat on which the spider was at rest, and the slight movement underfoot would stimulate it to rush out and have a hearty meal. The spiders were waylaying their prey underground in the dense forests of the huge fern plants. If spiders did not have silk, the number of species of spiders might have probably been fewer, as that of the scorpion. And, if it were not for their silk, various spiders would not have been able to inhabit diverse environments.
Spiders depend on silk throughout their lives.
However, insects became the champions of the land. The insects evolved, had quick movement and had two pairs of wings. In the old days, the spiders tried to capture insects, but the insects would have just flown into the sky by their wings and escaped. At that time spiders may have wondered about their future on Earth. Spiders untangled this hard problem.