Bugs are able to walk on walls and ceilings due to their specialized feet and adhesive abilities. Most insects have tiny hooked claws on their feet, which allow them to grip onto small irregularities in surfaces. In addition, many insects have tiny hair-like structures on their feet called setae, which can create a weak electrical attraction between their feet and the surface they are walking on. This electrostatic adhesion, combined with the physical grip of the hooked claws, allows insects to walk on walls and ceilings without falling. Some insects, such as geckos, have evolved even more sophisticated adhesive abilities, using tiny hairs called spatulae on their feet to create a stronger van der Waals attraction with surfaces. Overall, the ability of bugs to walk on walls is due to a combination of specialized feet and adhesive abilities, which allow them to navigate a wide range of environments.
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