By Arachnofail - 08/04/2016 04:16 - France - Goussainville
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Nothing irrational about it. Before humans could type "is this spider that's dangling three inches above my face poisonous" into Google, we had little way of knowing which ones were poisonous and which weren't just by looking. And while people can survive bites from venomous spiders with proper treatment, I've heard being bitten is still something to be avoided. There are still solid reasons to avoid the eight-legged demons, in other words.
To add to what #20 said, it's a part of our biology to be afraid of certain things. People can inherent a fear of things that scurry and make sudden movements, or things with a lot of little legs. That trait evolved because many spiders are venomous, so that instinctive fear kept our ancestors alive. It can be an irrational fear if you live in a place where most spiders are harmless, but it goes deep in our evolutionary history, and it's there for a good reason. It's the same reason people are afraid of heights, and some things smell bad.