
Our geese did enormous poos and what grass we had was left in a mess. Don't have them now but a near neighbour does, they are confined behind an electric fence and last time I was there there was a dead half eaten rat in with them so I guess they'd had it (or a bird had dropped it).
They are quite entertaining to watch but my dogs were terrified of them and the male was always sticking his beak through a wrought iron gate to challenge the dogs.