Could just be an ocularis but the throat and forecrown seem too white and could be a vagrant lugens. Author: ajohn Time: 3/12/2017 10:00
It seems fine for ocularis to me. The eyestripe looks absolutely typical for ocularis - very narrow along the entire length, not broadening behind the eye - and it looks like the entire upperparts are grey, including the rump. I think the grey nape and crown would also be unusual for lugens.
Welcome to HKBWS Forum 香港觀鳥會討論區 (http://hkbws.org.hk/BBS/)
Image Attachment: DSC09184 Wagtail sp @ San Tin.jpg (2/12/2017 23:40, 1.21 MB) / Download count 519