Spiders are fascinating insects.
Despite their many eyes, they have terrible eyesight.
Yet, they are great at catching prey.
A variety of characteristics contribute to their efficiency as predators; for some spiders, one key factor is their web.
When building a web, spiders will adjust the tension, length & density of their silk.
These variations allow them to feel different vibrations through each strand.
Spiders, with sensors on their 8 legs, can sense every tiny movement in their webs.
Sometimes, spiders will also initiate a vibration by bouncing or plucking on their web in order to receive more information from the echoes that return.
Through these vibrations, spiders can locate insects that have been ensnared and gauge their distance as well as their size.
Thus, with the aid of their webs, spiders have developed to be pretty great as predators.