On: Earthworms contribute to 6.5% of global grain prod...

[developer93]

Guess their evolution worked in your case, although seems like a risky strategy in the long term if predators get used to the idea.

[pvaldes → developer93]

Releasing luciferasa undergroung when disturbed Is probably aposematic. A way to claim "I taste awful" to rodents and moles, I suppose.

There are a few species in US also, like Diplocardia, that glows in electric blue.