s the spider to be a very efficient water conserver. This is
             one of the characteristics that spiders evolved to adapt to the harsh
             conditions of terrestrial life. There are eight eyes located in the
             head region usually in two rows, varying among families. Spiders that
             wait for and lunge at its prey will have a row of very large eyes well
             adapted at detecting the precise distance it is from its prey. Yet
             those spiders that make webs do not have as great a need for such
             advanced sight and have smaller eyes. But not all spiders have eight
             eyes. There are some spitting spiders that have only six, and there are
             some with only two or four eyes. Some cave spiders have no eyes at all
             and rely only on vibration. There are great differences in the ways
             which spiders capture prey. Some may stalk their prey, while others may
             lie in wait and ambush it. Other spiders may weave various types of
             webs used to capture passing prey, and there are some smaller commensal
             spiders that live in larger spiders' webs and feed on the smaller
             insects neglected by their host. (The Spider Book, J.Comstock)
             All spiders spin silk, though not all of them weave webs. Silk is
             most commonly seen used in forming webs, which may vary from a highly
             elaborated orb of spiraling threads to a sin
             ...