I recently (about 2 months ago) bought a beautiful yellow/green budgie named Sunny. The bird's gender is tbd but for now let's say Sunny is a girl. So, at first when we bought Sunny, my first bird, Coby, responded wonderfully, flirting with Sunny and even preening and feeding her. But lately, in the past few months, Coby's been acting strangely, chasing Sunny around and bullying her. He decides what perches she sits on and if she doesn't follow his rules, then she gets chased around the cage. This is giving Sunny some severe anxiety, which makes my heart hurt, since Sunny is such a sweet little bird! Coby, originally the sweetest bird ever, is now really territorial and bites me hard when I try and take him out to play with him! Please, what's going on! How can I help?