Initially it looks just like a flock of gulls flying off, but if you look closely you’ll spot the one dark bird (I think possibly a raptor of some sort, unfortunately I can’t remember) just right of centre.
Islay Pictures Photoblog
Pictures from the Isle of Islay, Scotland
PS: If anyone has any thoughts on what the dark bird is likely to be please let me know (I’m looking at you, birders). I can’t find the original picture at the moment, so the one on the blog is as good as it gets for now…