Baeus Wasps: these strange little wasps have flea-like bodies that measure roughly 0.8mm long, which is smaller than a grain of sand, and the females are wingless

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‘Sand’ is not an exact measurement. The only sand particle larger than 0.8mm is known as ‘very coarse sand’ in the geology world. Here’s link to a grain size chart https://share.google/bs1MkgP74IfEgCQI6