Almost all papers on this topic are certainly about fowls, quails and other human pets or zootechnician interest. Is very difficult study the mutations on wild populations (data collection, logistic problems, etc.). In my article database I found this title of 1987, about albinism, but I dont know if is focused on wild avifauna...

Boissy, R. E., G. E. Moellmann and R. Halaban, 1987 Tyrosinase

and acid phosphatase activities in melanocytes from avian albinos.

J. Invest. Dermatol. 88: 292–300.

Greetings

Thank you so much for your help!

Regards

Hi.

We are compiling now (for a future publication) many cases of albino and leucistic wild birds in the Canary Islands, and there are some interesting records, like completely albino Common Kestrels and Berthelot's Pipits. The number of bird species affected by such colour mutations, in different extents, can be large, but we have not finished our work yet. There are many publications on this subject in a pletora or journals worlwide.

Hi Ruben,

Thank you for your reply.

i was unable to find a picture of the four legged cattle egret chick ,i'll try sending it later. We also recorded a melanistic heron.

i've put this project on hold for a while, so i forgot some of the details.

Regards

Hi again.

There are also some interesting records of melanistic birds in the Canaries, with good examples with Cory's Shearwater and Blackcap, between others.

I attach two interesting papers about melanistic birds in the Canaries and other "Macaronesian" or Mid-Atlantic archipelagos. They are centred in Cory's Shearwater and Blackcap.

Thank you so much Ruben