brendank 12/11/2012 15:34
ID of Bush Warbler
12 November 2012 - Mount Davis
I was mobbed by this bush warbler this morning. Calls seemed typical of Russet Bush Warbler. However, undertail coverts look fairly clean to me. I was considering the possibility of Brown Bush Warbler. I think I can just make out a tiny bit of pale fringing but it seems very weak.
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Jonathmartinez 12/11/2012 16:03
pale base of lower mandible indicates Brown Bush Warbler. a very good find.
kkoel 12/11/2012 16:14
I think this is a Russet Bush Warbler because of the relatively clear supercilium and eye-line, plus well marked under-tail coverts not observed in Brown Bush Warbler. It is common for non-breeding Russet Bush Warblers to show paler lower mandible and even the cutting edge of upper mandible as shown in photos online and those taken by Geoff on Potoi:
[url]http://hkbws.org.hk/BBS/viewthread.php?tid=12951&highlight=russet%2Bbush[/url]
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lpaul 12/11/2012 16:30
Agree, Russet Bush Warbler, pale fringes to undertail coverts seem well marked to me.
Jonathmartinez 12/11/2012 17:06
sorry, from my experience in Hunan where both occur I never saw a Russet BW with so pale lower mandible, but after a quick check on OBI, I can only agree.
And agree with Paul that undertail covert are well marked, I focus to much on the mandible on my first post, sorry abouth that. So a less better find:-) but always a very enjoyable bird to look at:-)
brendank 12/11/2012 17:23
thanks, everyone!