Notaneggspurt
Songster
You can use a card board cut out of a silhouette taped to the bottom of a drone. Use it on a sunny day to cast shadows. Areas high in pigeons and other "nuisance" birds have done this with noticeable success. Just don't over do it or there's a chance in over stressing them and quite literally having them scared by any shadow moving. Not fun in autumn with leaves falling or having them scared to go anywhere with moving shadows.I seriously wish there was a drone fashioned in the silhouette of a hawk that I could buzz my chickens with a few times a day, get them in the habit of running from danger. If anybody knows of such a thing, post it.