A face only a mother could love

The birds were very skittish this morning when we ate our breakfast outside on the patio. They would land on the nearest feeder to us and pause only for a fraction of a second before making their escape.
Then came this chaffinch, who stayed for several minutes. He was really enjoying his feed.  He has a sunflower seed end-on in his mouth here, which is why he looks a bit odd. He was a fabulous colour though, with beautiful wing feathers.
I could see that he had very knobbly feet, and when I  looked at the images I could see just how bad they were. I then looked at a photo of a chaffinch on Google - and his feet were normal sort of "birdy" claws. A bit of investigation and I have made his diagnosis - he has almost certainly got "chaffinch viral papilloma".
According to the RSPB:
This virus is specific to chaffinches only. Although it looks unsightly and certainly is a great nuisance and irritation to the bird concerned, it is rarely the cause of demise for the bird. The papilloma has low contageousness, and birds need a close contact with each other for the infection to be passed on. This is probably why it is normally seen in clusters. It is believed that a bird will need a cut or a scratch on its foot for the disease agent to enter and infect it. There is no cure for this kind of skin infections in wild birds, and the only thing we can do to help is to make sure that there are no sharp bits in the feeders that could risk a bird cutting its foot as it is looking for food.
I think that that may be the reason that he stayed and fed for so long - because he was there on the perch, with plenty of food, and decided it was a good opportunity to fill his tummy without walking about on his sore feet.