Hmmm! Cats and squirrels (the "tree rat" kind !) will dig them up....but there they lay ! Deer supposedly won't eat iris ....but I have heard reports of them up rooting new plants, but I would think they would be laying close by. Rabbits might chew the leaves, but the "bare "rhizome would still be there. Slugs, snails, and earwigs aren't big enough to carry them off, even if they worked together (and I think they belong to different unions, so it's pretty unlikely)....that leaves dogs...using them for chew toys...kids...being kids....or, senior moments on your part...did you REALLY plant them? or just think you did?....Garden Gnomes ( we have Garden Gremlins, here) would be the only logical thing left !.................Arlyn
