Oh yes, glorious maggots. Does anyone know what it is they excrete after feeding on carrion? I know of the medical mumbo jumbo about antimicrobial things and what-not, but they must produce something useful to the ground itself, yes?

http://en.wikipedia.org/wiki/Maggot_therapy

http://jac.oxfordjournals.org/cgi/content/full/61/1/117

 

There are some hints there... but I haven't found if the articles describe the bulk of the excretions - perhaps just some small components that are of importance.