In my opinion ssp. superciliosus
In "Shrikes - A Guide to the Shrikes of the World" (1997) the text for this ssp. says: "Upperparts much more rufous than in other races and the white frontal patch wider; underparts also more rufous"
In "The Howard and Moore Complete Checklist of the Birds of the World" (2003) the winter quarters for the four subspecies are given as: "S and SE Asia" (ssp. cristatus), "Thailand, Malay Pen., Sumatra" (ssp. confusus), "Philippines, N Borneo, N Sulawesi, N Moluccas" (ssp. lucionensis), and "Sundas" (ssp. superciliosus)
L. c.. cristatus after double checking with my local contact in Borneo.
Only one subspecies is looking like your Brown Shrike from Borneo, and that is superciliosus, not cristatus
I have seen a few superciliosus birds in South Korea, and they were much more warm rufous/reddish brown above than this bird, so I would rule out that ssp.
I agree with Jens on the Rufus/Brown aspect, but I am no expect. However my local contract is one of the "guns" and at the top end of the lst of species seen in Borneo and when it comes to Borneo and its birds, so I trust his judgement.
Best Regards, Mark
I´m also under the impression that superciliosus has obviously more rufous/reddish on crown and upperparts than shown in Marks bird, but then again I´m not an expert on Brown Shrikes. However, how well can can such an image be trusted regarding true colour, only Mark would know. it´s a well known fact that cristatus can show similar underparts colour as MArks bird.
Apparently a difficult complex with a certain degree of ingergrades.
According to this article
lucionensis winters in Borneo and might look similar regarding crown pattern, however, not the rest of the upperparts.
Another another piece here
Watch out, I took the liberty to put it on Surfbirds Forum for more opinions.
Excellent article from Alan. Just to assist, the photo is as taken on the day, there have not been any changes to contrast, hue etc. Hoveder, the photo was taken early afternoon when the sun was high and very bright.
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