The hunters listen to both high and low frequencies but only low ones trigger an attack
Some spiders wait for prey to come and tickle their web. But the ogre-faced spider (Deinopis spinosa) uses its sense of hearing to take its web to the prey.Hanging upside down, the spider weaves a rectangular web between its legs. When an insect flies behind the daStafstrom and colleagues inserted microelectrodes into the brains of 13 ogre-faced spiders, and then played tones of varying frequencies from a speaker while monitoring the spiders’ auditory nerve cell activity. Spikes of activity revealed that the spiders can sense airborne sounds between 100 and 10,000 hertz, though not at every frequency, the team found. (Humans generally hear between 20 Hz and 20,000 Hz.)ngling arachnid, the spider swings backward, casting the web toward the prey.
