Hello. I have a female budgie and she is 7 or 8 months old. Today I left the house for three hours. Before leaving, there was nothing wrong with her. I just came back 15 minutes ago and her tail is completely gone! There is nothing left! She doesn't seem distressed or in pain. She is flying, chirping, active and energetic. Her breathing is fine. Her droppings are fine. No poop stuck to her vent. No bald spots on her body. There is no bleeding. She has been losing feathers for a few weeks during preening and I have been finding little dropped feathers in her cage and around her favorite perching spots. She has a few pin feathers on her cheeks. There are no other animals in the house that can attack her. She has a pretty big cage. No sharp spots/toys in her cage. Please advise. Is this normal?