Why do spiders have 8 legs?

It seems that there is no ideal number of legs. Humans have two, dogs have four, insects have six, and centipedes can have more than 1,000. So what made spiders settle for eight legs?

“I think the best answer and the easiest answer is that spiders have eight legs because their parents had them.” Thomas Hegna, assistant professor of invertebrate paleontology at the State University of New York at Fredonia, told Live Science. “But then it goes into a kind of regression, and somewhere it all had to start.”

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