How black soldier fly larvae can demolish a pizza so fast

Masses of larvae make a living fountain that knocks the slowpokes up and away

black soldier fly larva

NOM, NOM  Look and learn, humans, as the black soldier fly larva (SEM view of one shown here) demonstrates just what it can do when those mouthparts encounter a pizza.

Eye of Science/Science Source

It all started with the can’t-tear-your-eyes-away video of black soldier fly larvae devouring a 16-inch pizza in just two hours. Watching sped-up action of the writhing mass inspired mechanical engineer Olga Shishkov of Georgia Tech in Atlanta to see what makes these insects such champions of collective feeding.

An individual Hermetia illucens larva doesn’t eat steadily, Shishkov found. One feeds for about five minutes on average and then stops for about another five. As a group of thousands, though, they flow continuously like a living fountain splashing up against the edge of their food, Shishkov and colleagues report February 6 in the Journal of the Royal Society Interface

Shishkov borrowed techniques from the study of fluids, for instance treating larvae as particles moving with a current, and looked for overall patterns of flow in a writhing mass of as many as 10,000 insects. She tracked the directions larvae were wriggling and found that, around a chunk of food, a fountainlike flow develops.

As larvae took a break from binging, the hungry crowds pressing from behind forced them upward. Those at the top then fell away from cliff-face of food. This up-and-out push lets a larva eager to feed replace one that’s taking a break.

The voracious feeding of black soldier fly larvae isn’t just nature as entertainment. The larvae define edibility broadly — pizza, garbage, animal waste, it’s all good. So people searching for ways to make food systems more sustainable wonder whether there’s an opportunity to recapture what would usually be wasted by letting the larvae devour it and in turn, feeding them to chickens or other animals that people eat. That’s certainly one reason to embrace a species that not only eat garbage but can handily murder a pizza. Also, Shiskov says, “they’re the cutest maggots I’ve ever seen.”

NO CONTEST This large pizza doesn’t stand a chance against a horde of black soldier fly larvae. Thousands of these maggots demolish the pie in about two hours, as seen in this high-speed video.

Susan Milius is the life sciences writer, covering organismal biology and evolution, and has a special passion for plants, fungi and invertebrates. She studied biology and English literature.

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