[cogitator]

According to the article that's at the second link I posted, the researchers don't just theorize that the worms eat the leaf litter at a rapid rate, they've measured it. Read the paragraph that begins "Gundale suspected..." in the second article.

[presidio9]

Read the article again. The scientists proved that the worms are capable of eating leaves and plant matter, not that this is common behavior for them in the wild.