Spiders hear noises using sensory hairs, but it was thought that these hairs could only pick up very close sounds. This finding shows that jumping spiders actually have an acute sense of hearing.
"Their sensory hairs are basically everywhere, but especially on their legs and their head -- and there are lots of them, not just one or two," Shamble said. "That said, these are the only things they have for hearing sound; spiders don't seem to have proper ears at all."
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As for why jumping spiders evolved such great hearing, the researchers suspect that they use the sense to listen for predators, such as parasitoid wasps. The ability could have a role in attracting and impressing mates. The spiders may also be listening for prey.
Since, as their name suggests, the spiders like to jump, they are known to pounce on people. Some are even black and red in color, causing some to think they are being attacked by a black widow, but Shamble said that these spiders hardly consider us to be prey.