Now would be a good time to introduce a new goose. Hormones aren't very high yet, and I have had an easy time with introductions here lately. You could get any age from spring 2012 hatch and up.
I occasionally have to keep my together for one reason or another. The most important thing you can do is to provide safe space for the chickens- like high perches, and maybe a crate with a smaller door that the ducks can get into, but not the goose.
Geese can and will kill chickens if the...