Worms were discovered that eat styrofoam. There was a lot about it going on the news last summer[0].
0: https://www.scientificamerican.com/article/superworms-eat-an...
0: https://www.scientificamerican.com/article/superworms-eat-an...
"Rinke and his colleagues are not suggesting that superworms should be released into landfills or polluted landscapes to munch through mountains of plastic"