There are two nuthatches that regularly feed at our feeders. One has all the normal plumage but the other (I have posted a pic on the observations site)has no eye-stripe at all. I was wondering if anyone else has come across this variation before.
A close look at your posting show a very faint eye-stripe on the nuthatch. The bird looks rather pale generally so I suspect leucism, a genetic trait characterised by a reduction in dark pigmentation. Quite common in some birds such as dunnocks or blackbirds but I've never heard of a nuthatch with this before.