My budgie Oliver regurgitates a lot for my other male (?) Budgie Winston. He also bobs his head and gets very excited to see Winston. Oliver often kisses Winston's beak too. I am pretty sure Winston is a boy because his cere is pink like a young male, but, it is almost his first birthday and his cere hasn't changes colour at all. Could Winston be a girl and Oliver is trying to impress her? Or could this just be brotherly love?