Old budgie meets new budgie and becomes aggressive
I have separated my new budgie and old budgie into different cages, my old budgie is now returning to how he use to be but as for my new budgie he will no longer eat out of my hand since taking my old budgie away. Does this mean I’d have to start training all over again with sticking my hand in the cage but not interacting with the budgie so that it gets use to my hand without my old budgie being present and slowly work up from there? And is it okay for my old budgie to wonder in and out of the new budgies cage every now and then or should I stop this from happening?