How big would a spider have to be before it was unable to stick to the wall? © Getty Images

How big would a spider have to be before it is unable to stick to the wall?

Want to be the next Spider-man? We’ve got bad news.

Some spiders can stick to walls because their feet are covered in tiny, flexible hairs that create an attractive force with a dry surface. In theory, there could be spiders as large as cats scaling walls, but they would need to have really enormous, broad feet.

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This seems unlikely, as evolution has never produced a body plan like this. Plus, there are other constraints that limit a spider’s body size, such as its inefficient respiratory system.

Asked by: Pad Scalon

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