Is this be a Great Reed Warbler of the race Acrocephalus arundinaceus zarudnyi? These may (should) occur on migration in Eastern Arabia and this bird looks to be quite grey above and white below with a well marked supercilium and dusky lores. It does; however, appear to have a slightly warmer coloured rump. The photograph was taken on 5th May 2011 in Dhahran Eastern Saudi Arabia.
Link here to the OBC images site http://orientalbirdimages.org/search.php?Bird_ID=1761
and here to Netfugl site http://www.netfugl.dk/pictures.php?i...cture_id=27845 of good photographs of A a zarudnyi, which also appear to show a slightly warmer coloured rump.
There are also some photographs of Great Reed Warbler from eastern Saudi Arabia here http://www.birdsofsaudiarabia.com/20...d-warbler.html showing what looks like a more typical Acrocephalus arundinaceus arudinaceus bird. These were taken on 3rd May 2011 at the same locality as the photo posted here. This bird has much warmer general plumage and particularly underpart colouration, than the bird depicted here.
Is there anyone familiar with this/these sub-species who can throw some light on the subject? Comments on this/these bird(s) are very welcome.