Plastic-eating caterpillars could save the planet

"...It remains unclear, they said in a statement, whether the caterpillars digest the plastic with enzymes in their gut, or whether they break the substance down through a process of "mechanical milling"—in which case the plastic would be excreted chemically unchanged."
2017
https://phys.org/news/2017-09-german-scientists-plastic-eating-caterpillars.html

‘A huge step forward.’ Mutant enzyme could vastly improve recycling of plastic bottles By Robert F. ServiceApr. 8, 2020 , 5:45 PM
https://www.sciencemag.org/news/202...ould-vastly-improve-recycling-plastic-bottles
 
mlawson71 said:
Why else would they eat it then?
More...
To escape the plastic bag she put them in.

I might have a different guess if she found them still munching on the bag ... after they had already made holes big enough to escape through.

Regarding The experiment:
The article doesn't detail the experiment enough to offer a guess.
 
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