RSPB answer questions about Leucistic birds. It also talks about abnormal plummage in some species that can cause confusion in abnormal plummage for some people sometimes Don’t be put off by the word desktop in the link it works on any devices not just desktops. I hope you find it interesting. I thought this might be helpful for people. exspeacialy ones who havnt seen a bird with abnormal plummage before or might not know much about it or for some people who have seen any birds with unusual plummage in gardens
https://www.youtube.com/watch?app=desktop&v=_gq4_paCRX4