Occasionally, our flock of about 15 Tufted Roman Geese will sneak into the fields and nibble flowers, which usually results in their pristine white feathers becoming streaked with yellow pollen. While it seems the flock of "guard geese" could be useful in helping to dis-bud the lilies, that would only work if they could be trusted to leave enough unmolested flowers for the camera - or not break stems during a Gander (male bird) disagreement. In my vegetable garden, pumpkin, squash and cucumber vines are securely fenced off, because within a few minutes, there would be nothing left. Notice the neatly trimmed cucumber vines?
Ancona ducks keep their heads to the ground looking for worms, beetles and slugs, and do very little damage after lily stems are at least 2 feet tall. They are invited into the small flower garden for about a half hour every week or so, to scoop up any newly hatched slugs. We keep them out of the strawberry patch, because ducks are very fond of ripened red berries - we prefer to have our fresh homemade jam!
Waterfowl tend to the lily field just before harvest: Geese eat fresh chickweed which tends to tangle up in the bulbs coming over the harvesting belt, and ducks go over the ground looking for tasty slugs, which are not terribly fun to pick up unexpectedly along with a lily stem.