My dh has a coworker who says chinese geese will even keep coyotes away? Does this ring true for anyone else? I ask because we have a fox hanging around. Now this year he is not as brave as last year. He has been getting our ducks in the late evening before we get them shut in. Last year he was getting them during the day when we were gone. We have an outside dog that barks but doesn't seem to keep the fox away. How aggessive do the geese get? Thanks.