Thank you for your response. I will know have to have a read about coalface to better understand. I was aware there were no black budgerigars in Australia and I wasn’t meaning to waste anyone’s time I was just very surprised and when I showed his picture to someone of a budgie club trying to understand why he looked like this and he made me feel that I had a freak of nature and although he may look odd he is a beautiful loving fledgling and definitely a fantastic family pet. I made the post in the hole of better understanding budgie genetics and mutations.