Here is something I found on the Brooklyn Botanical Garden Web site. Niall Dunne writes (http://www.bbg.org/gar2/topics/essays/2004su_worms.html) that exotic earthworm species, dumped by sport fishermen at the end of an fishing trip, are destroying North American forests. The worms speed up the decomposition of the leaf mulch on the forest floor, making the soil too nitrogen rich and clearing the ground for other plants to take root and compete with the native forest plants. More at Minnesota Worm Watch (yes, I am amused by the title): www.nrri.umn.edu/worms/default.htm I never thought of earthworms as anything but good. Vermicomposting takes a hit, and I thought it was as close to delightful organic gold as I could get. It also stirs up the more broad native-exotic debate in my skull.