Hi Kerry
Congratulations on your new Kakariki!
As he has already shown aggression towards your budgies, you should not ever let both species of birds out together. It's fine to keep their cages in the same room, as long as it is not stressful for the budgies or kakariki and as long as you supervise out of cage time to ensure nobudgie lands on the kakariki's cage (and gets their toes bitten off!
). If that is a concern, however, you should put their cages in different rooms.
All birds have different personalities, so your Kakariki may not act a certain way.
Congratulations on your new Kakariki!
As he has already shown aggression towards your budgies, you should not ever let both species of birds out together. It's fine to keep their cages in the same room, as long as it is not stressful for the budgies or kakariki and as long as you supervise out of cage time to ensure nobudgie lands on the kakariki's cage (and gets their toes bitten off!
All birds have different personalities, so your Kakariki may not act a certain way.