I recently got my first pair of cockatiels and just the other day I noticed that one was on top of the other moving their tail back and forward, does this mean they are mating already? I find it a bit too soon since I just got these birds two weeks ago, but I do know they are at least two years old so does that mean they are just happy or do they want to reproduce already? I really don't know much about cockatiels and I don't want to get this wrong, please give me some advice so I can understand my birds a little better. Thanks everyone.