Netcasting spiders spin small webs which the hold with their 4 front legs. They plop these webs down on insects crawling nearby and also use them to catch flying insects. These spiders have enormous eyes that are some 2000 times more sensitive to light than our eyes. Jay Stafstrom has been studying these spiders and finds that blinded spiders cannot catch crawling prey but are perfectly capable of snaring flying insects. In Ron Hoy's Lab at Cornell, Gil Menda has recorded from the spider's brain and found that they are sensitive to low frequency sounds, like that of mosquitoes but are also sensitive to high frequencies, near 5,000 Hz. The function of this high frequency hearing is still mysterious.