I'd be tempted to say it's an Isabelline. Unfortunately with only two 'less than perfect' pictures, it's hard to be 100% confident, for me at least. Some more images?
In favour of Isabelline:
- all white underwing, unfortunately only the axilliaries are well exposed and some Northern wheatear do show mostly white axilliaries too, nevertheless this looks good for IW
- pale sandy tones of plumage
- dark isolated alula (very strong pointer in favour of IW!) seemingly darker than the centre of the greater coverts
- seemingly reduced white patch on the rump/uppertail coverts (hard to assess though)
- very pale/silver inner webs of primaries (but beware of worn NW!)
- the legs look long and strong
2 things bother me:
- the bill looks smallish
- the structure on the second pic does not look typical for IW, but it's only a pic
Additionaly, the face pattern may cause some concern (or not) with some more images, but it seems to me that the supercilium doesn't extend behind the eye (or just marginally), which is good for IW.
Edit: forgot to mention the tail pattern...it could fit both species IMO. I would be interested to see what others think...
Last edited by Tib78 : Wednesday 26th December 2012 at 15:01.