Hi. Currently we have 4 ducklings, the mom, and 4 other adult ducks. The ducklings are almost 3 weeks old. Tonight was the first night we tried to put all of them in the same cage. Well, the mom ended up biting/attacking one of the other females. Does anyone know how long it will be until we can keep them together/how old do the ducklings have to be to keep them in the same cage?