Quote:
Originally Posted by yvanleterrible
I might be venturing out of competence here but I think it has to do with the size of the chalk particles. To climb vertical surfaces insects rely on fine cilia distributed on their limb tips. Chalk particles could accumulate between cilia and prevent adhesion to surfaces for a good safe climb. Ants are notoriously clean creatures and must notice the disruptions so they'll avoid chalk when they get to it.
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In the absence of any actual experts, I'll take that theory.
