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Warbler & raptor, Loei, Thailand

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Old Monday 16th April 2018, 14:00   #1
BKKBen
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Warbler & raptor, Loei, Thailand

Hi again,

This warbler was seen at Phu Suan Sai NP, on April 14th - is it a Dusky?

The raptor was seen flying over a provincial arboretum (April 15th), about 60km south of the Laotian border. More so than my previous raptor post, these pics are probably not all that helpful, but the bird was watched heading south to north in a straight line, with a few shallow wing beats followed by a glide, repeated.

It appeared quite long-tailed and long-winged and relatively pale underneath, and my intial ID was a Eurasian Kestrel, though both Robson (and eBird) have this area being a little out of range for this species.

Thanks again for all assistance,

Ben.
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Old Monday 16th April 2018, 16:18   #2
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The warbler does look good for Dusky.

The raptor looks a bit like a ringtail Harrier?
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Old Monday 16th April 2018, 16:28   #3
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Quote:
Originally Posted by andyb39 View Post
The warbler does look good for Dusky.

The raptor looks a bit like a ringtail Harrier?
Agreed. I would lean towards Pallid for the Harrier due to very slim appearance. But impossible to be sure...
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Old Monday 16th April 2018, 16:36   #4
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Pallid is a vagrant to Thailand and has only been seen in the south according to my copy of Robson.

Perhaps more likely is Pied, which is a regular passage migrant in NW Thailand.
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Old Monday 16th April 2018, 20:25   #5
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Admitt I only checked the Species list for species recorded in Thailand... well, it's a Harrier. Difficult to say which based on these images.
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Old Monday 16th April 2018, 23:55   #6
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The warbler looks better for Radde's to me, with fairly thick pink legs and what seems to be a short, thick bill (but hard to be sure on these photos).
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Old Tuesday 17th April 2018, 03:03   #7
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Both a bit tricky but I think Radde’s and Eastern Marsh Harrier.
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Old Tuesday 17th April 2018, 03:21   #8
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I see what you mean about the thickness of the bill and legs on the warbler, but I'm not seeing a buff lower belly and vent. Maybe it would come out with adjustment for exposure.

Re the Harrier, can Eastern Marsh show such a large white rump?
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Old Tuesday 17th April 2018, 05:43   #9
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The warbler looks better for Radde's to me, with fairly thick pink legs and what seems to be a short, thick bill (but hard to be sure on these photos).
Now that you brought Radde's up, the supercilium is indeed rather ill-defined in front of the eye and extends far to the nape... Probably the better candidate.
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Old Tuesday 17th April 2018, 11:07   #10
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I see what you mean about the thickness of the bill and legs on the warbler, but I'm not seeing a buff lower belly and vent. Maybe it would come out with adjustment for exposure.
The buff underparts are more a feature of autumn juveniles than of adults, which can seem duller and browner: http://orientalbirdimages.org/search..._ID=&Location=
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Old Tuesday 17th April 2018, 13:25   #11
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The buff underparts are more a feature of autumn juveniles than of adults, which can seem duller and browner: http://orientalbirdimages.org/search..._ID=&Location=
Good point raised by John, in the west we are more familiar with bright juveniles/1st-winters, spring adults are altogether duller by comparison. The structure however, clearly indicates the OP is Radde's.

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Old Tuesday 17th April 2018, 23:55   #12
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Originally Posted by Grahame Walbridge View Post
Good point raised by John, in the west we are more familiar with bright juveniles/1st-winters, spring adults are altogether duller by comparison. The structure however, clearly indicates the OP is Radde's.

Grahame
Thanks to all for the help. I originally didn't think Radde's because of the lack of colour on the undertail coverts, but I guess I should've also been looking at other features as well.

Thanks also re: the harrier. I'm not very familiar with harriers and didn't even think about that possibility. Regardless of species, it's the first harrier I've seen in Loei; I'll have to keep my eyes out for more next time I'm up there!

Thanks again. All help is greatly appreciated!

Ben.
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