My interest in odd plumages and colour mutations in birds was given a huge boost recently. I had a meeting with Hein van Grouw, curator of birds at Tring natural history museam, and a leader in this field. I learned a lot and he gave me a couple of the papers he had written. (Links below). A very interesting read.

www.ekstersenzo.nl/images/pdf/kleurmutaties-db28(2)_2006.pdf

iss.wnb.uz.zgora.pl/assets/files/didactic/rozdział%2030-55.pdf

Hein was very interested in my photos, below are some from this year.