I wonder how common it is for robins to suffer major feather loss?
I ask because I came across one this week at a local nature reserve. It had lost most of the feathers from its head and neck but the rest of its body looked healthy. I therefore deduce it has something to do with preening since the loss is confined to the areas that the beak cannot reach. Last year I saw photos of a blackbird in a similar condition. Possibly mites are eating away at the feathers - maybe even carpet-beetle larvae?
I also observed that the body feathers were fluffed out as in winter, presumably to compensate for heat loss from the head area.
Has anyone on here seen similarly affected birds?
You can see two pictures of my poor specimen on the following links.
http://www.flickr.com/photos/gen2/6938190648/
http://www.flickr.com/photos/gen2/6938190872/