Hello, my budgie plays with my sisters budgie which is a couple (one boy, one girl). Whenever my budgie is playing with them or eating, he tries to put his feet on top of one of the other birds like kind of pushing them off a cliff kind of situation. He always fights over the food (Espically when they are at my budgies cage/playground). Can someone please tell me what I should do to stop him from doing that. I always have to intervene so the other budgie doesn’t fall.