cywong

Mai Po,  27/03/2010

lpaul

Such birds are gutteralis/tytleri intergrades (sometimes in the past treated as a distinct subspecies 'saturata') and as such are almost certainly from ne China/Kamchatka/Lower Amur.  Such birds have been claimed as tytleri in the past but that subspecies has slightly darker and uniform underparts (not paler on flanks like these bird(s))

Sze

Quote:

Original posted by lpaul at 15/04/2010 08:50
Such birds are gutteralis/tytleri intergrades (sometimes in the past treated as a distinct subspecies 'saturata') and as such are almost certainly from ne China/Kamchatka/Lower Amur.  Such birds have  ...

Hi Paul,

Thanks for your sharing and information!

And I have a doubt for a long time that I sometimes saw some Barn Swallow juvenile with rufous underpart, but both of the parent are without rufous underpart, just like the photo show in the link. http://www.hkbws.org.hk/BBS/viewthread.php?tid=11232
Does it mean "rufous underpart" maybe show in young stage, although the barn swallow is the offsprings of subspecies "gutteralis"?

And how about this one? Is it tytleri?
http://www.hkbws.org.hk/BBS/viewthread.php?tid=1972&extra=page%3D3

Thanks again!

[ Last edited by Sze at 15/04/2010 14:17 ]

cywong

Thanks to Paul for the information provided.