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This question already has an answer here:

My question is very simple: How insects move opposite to gravity? please dont tell me that they have Sucks because my comment will be what about insects if move on smooth walls like glass.

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marked as duplicate by John Rennie, Community Apr 8 '17 at 16:12

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

  • $\begingroup$ Opposite to gravity? Is your question rather why insects don't fall of glass? $\endgroup$ – Mr Puh Apr 8 '17 at 15:46
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From: https://www.scientificamerican.com/article/how-do-flies-and-other-in/

"The segments, or tarsi, at the end of insect legs possess clawlike structures that help the insect hold on to different types of surfaces. These tarsal claws are used to grip the tiny irregularities on rough surfaces. But in some cases, insects do make use of a kind of adhesion. If the surface is smooth, the insect can hold on using the adhesive action of hairs located on sticky pads (known as the arolia or pulvilli) on the tarsi.

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