Hi, first post, hope its ok to add a comment.. They seem not to tolerate straw, hay, cut gravel, eggshells, grit, copper, wool. Im a no digger, I think this might be a key point as all over my beds I see little toad dug outs and if lucky I sometimes see one ( I love em) but rarely do I see a slug or snail. Theres voles too and birds and many more about. I made it wildlife orientated, so alot of little helpers that patrol.