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What is the weight of fairy fly?

Updated: 4/28/2022
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12y ago

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The "fairy fly," actually a species of parasitic wasp, battles with a near relative for the title of World's Tiniest Insect. With the upturn of an even more diminuative subspecies, the fairy fly is again in the lead with a body length of 0.14 millimeter.

Few field scales have the precision to weigh this little sucker, but we can make an estimate based on another insect: the ant.

Ants and wasps are closely related, so they share the same general form, although the fairy flies are on the delicate side even given their tinyness.

Ants vary greatly in body size, with the biggest jumbos standing in the same relative proportions to their itsy cousins as elephants do to housecats, but we can pick one species, the carpenter ant, which is 6 millimeters long (about halfway across your little fingernail) and 3 milligrams in weight (the standard 325-mg aspirin tablet is about 370 milligrams, counting the filler).

OK, now as the carpenter ant is 42 times longer that the fairy fly, its mass is something like the cube of that (42 x 42 x 42). Divide that number into 3 milligrams and you get 40 nanograms. However, side-by-side pictures of ants and fairy flies shown the former to be quite a bit more robust.

A reasonable estimate would put the fairy fly at 25 nanograms.

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12y ago
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