Hello, A few months ago my boyfriend and I adopted a male cockatiel. Someone was giving him away because they have cats who harassed him. The man was in a hurry and basically threw the bird cage at me and wouldn't take the time to answer any of my questions about the bird. He said he didn't know his age and he didn't have a name, they just called him "pretty bird". Of course I felt horrible for the bird, now called Bert. Bert was not shy at all. I had my hand on the cage in the car and instead of acting frightened he just came up and started attacking my hand. Forgivable, of course, I was sure he was just scared. Here comes the part where I ask for advice. Every day and all day Bert screams. Extremely loud. A constant screaming. He only stops when you stand next to his cage. Obviously I can't stand next to him all day. Bert is allowed time out of his cage, but the problem is he is extremely hard to put back in his cage. For the most part he is nice when he is out of his cage, but his response to everything is attacking/biting. He attacks when I change the food in the cage, he attacks when we try to get him to put him up (or fly's away), he even attacks when I'm just standing next to him. Sometimes he makes such sweet, pretty sounds to us, and even says pretty bird. It's like a completely different bird. I thought maybe he was just lonely which was why he was screaming all the time, so we adopted another male cockatiel, who is now Ernie. Ernie is the exact opposite of Bert, he's shy and quiet. He was never handled in his previous home, which is fine, I just wanted Bert to be happy. Sorry for the incredibly long explanation, but does anyone have any advice for the all day, constant, incredibly shrill screams? Or for the attack biting? I wish I knew more about his past, but unfortunately I do not. Thanks in advance for any responses!!!