How spiders learn to build webs?
Scientists had shown that the web building skills of spiders is in-born, i.e., they do not learn from their parents. Scientists isolated a new born baby spider in a test tube and keep it away from other spiders. They feed them until the spider became an adult. Then they released it from the test tube. The spider started to build the webs, with some more practice on their own, it build webs as good as normal spider. But then as the whole spider weaver group, how did they acquire the web building technique? This is a long evolution story. In short, with some guessing, the story are told as follow. Hundreds of millions years ago, the spiders did not build webs. No insects could fly. The spiders were just walking and jumping on the ground chasing for the insects. They did use silk but just to make egg-sacs to protect the egg they laid. One day, a spider was born with the behaviour that it would attach the silk to the floor when they walked or jumped. This behaviour had some advantages. It
