According to an article from treehugger, and you can follow the links for more articles.

Here’s also the article that treehugger links to;

They can’t eat a lot of it very quickly, but it’s a promising area of research, and apparently the waste castings are perfectly fine to use in crop soils. Also mentioned in the Stanford article is research showing that waxworms, the larval form of Indian mealmoths can biodegrade polyethylene. Now they have to figure out if the mealworms are safe for other animals to consume.

So; worm gut bacteria. Marvelous stuff.