I haven't seen a slug on my block before, but this morning there were like thirty of them scattered across the sidewalk. They were UGLY slugs, too -- looking for all the world like dog-poo. Normally, I would have delighted in the slaughter of such hideous creatures, but I didn't feel like risking getting bits of them stuck in my shoes. I guess 'looking like dog poo' is their defense mechanism, and it seems pretty effective... evolution wins again!