I have two female Budgies...Abbey and Sadie. I'm considering fostering two more females(the owner has become ill). Athough my two squabble from time to time, there is not any real fighting, and they actually enjoy each other...preening and regurgitating. Would there be a big problem homing the two new females in the same cage with Abbey and Sadie. My two are semi tame...I'm still working on it after making some mistakes! The two new girls are tame...The cage is large, and space is not a problem.