Have a look at this one:
Have a look at this one:
To me the bird looks wrong for a Booted Warbler in many ways:
-the tip of the bill looks quite swollen, it should at least usually be pointier on a Booted Warbler
-the tip of the lower mandible is pale
-the supercilium does not extend beyond the eye
-there's no dark patch above the supercilium (or at most a very weak one)
-the shafts of the tertials are only slightly darker than the webs
-the flanks are quite pale
I know that there's a lot of variation regarding these features, but especially the features regarding the head and bill gives the bird a strange look for a Booted Warbler (well, to my eyes at least). I also know that measuring the bill length of small Hippolais warblers has sometimes proved to be quite difficult even for experienced ringers (I don't know any details regarding this specific case and I believe that the ringers are very experienced, I just wanted to state this as a perhaps useful notification). It looks like an interesting bird in any case, and I'm far from an expert!
I will reply in detail later, but at first glance this looks like Hippolais pallida pallida, and the biometrics of the wing seem to fit......?
It would be brave to go against Lars Svensson, so the following comments are not really, but are raising an alternative possibility.
As I have said previously, there is much on this bird that reminds me of the North (-east) African race of 'Eastern' Olivaceous Warbler pallida. Virtually all of the measurements given would equally fit pallida/laeneni, e.g p1>pcoverts, p1-p2, p2=p7, wing length, etc.. Some fall just outside, e.g. bill length and tail length, but to quote Lars, 'Measurements don't worry me so much, we all measure slightly differently, and a few birds fall outside ranges given in the literature'.
So if we then examine the plumage, there seems to much more that suggests pallida rather than caligata (as CAU has mentioned): the supercilium, which is restricted to just above the lores, and lacks any darker shadow above; the suggestion of a pale edges to the secondaries, though in truth this is not necessarily a feature of pallida; the lack of darker centres to the tertials; the lack of a dark tip to the lower mandible - the upper mandible looks rather pale as well. Equally, the structure of the bill looks quite strong; the head shape looks strange for caligata.
Here are some elements of Lars's paper in Birding World when he describes caligata: 'round-headed', 'a fairly well-marked supercilium with a hint of a dark loral patch', 'the tertials, some greater coverts and the central tail feathers have rather dark centres and contrastingly pale edges' (though this may be more applicable to fresh birds). One could argue that the Israeli bird contradicts these, to some extent.
Pallida breeds in Egypt and northern Sudan, and Svensson states, 'apparently enters from N Sinai into Gaza'; he also mentions that 'birds presumed to belong to (pallida) or intergrades between pallida and elaeica, occur as stragglers to Eilat'.
Could this bird be pallida, an intergrade or caligata? There are reasons it may be pallida...
Have got the opinion of David Pearson on this warbler - he knows as much as anybody about the pallida/caligata/rama group.
'I would think itíd be caligata. The billís too short and the head looks too rounded for nominate pallida Ė which is like elaeica except for the shorter wing. The bill does seem rather stout, but of course we donít have a dorsal view. And there is as you say minimal darkness near the l.m. tip. But the head pattern with trace of dark line above loral stripe, dusky lores below it, and well marked eye-ring would suggest caligata rather than pallida. Rama ruled out I guess from T/W ratio and short bill.'