The Canada Goose may be a male and looking to breed or remove others from its territory. Yes, you need to place it in a setting so that it is relatively the same size and age of other waterfowl such as geese. A large goose can seriously hurt a small duck. He/she should be much more comfortable among other geese as well as the ducks being much more comfortable remaining among the same species or same sized waterfowl. The Regal Swan