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Definitely not Ratt and you say have seen many-really? Then you could have least attached an image of the relevant taxon for Sikkim which is nominate flavicollis rather than albicollis from the W Himalayas.
The OP lacks a white orbital ring and black whisker, not to mention bill and tail structure are completely wrong + wrong bare bare part colouration.
Definitely not Ratt and you say have seen many-really? Then you could have least attached an image of the relevant taxon for Sikkim which is nominate flavicollis rather than albicollis from the W Himalayas.
The OP lacks a white orbital ring and black whisker, not to mention bill and tail structure are completely wrong + wrong bare bare part colouration.
Yes of course Grahame. I posted this taxon just as a indicator that some Yuhina do show a white collar. And it is also relevant to mention that many Yuhina I have seen don't show a strong orbital ring. I look at the face colour and underpart colour of the OP and don't see Grey-Crested Tit. Brown face and pale underparts.
I don´t see something yuhina-like in this bird , to me a good fit for grey crested tit. The rather contrasty white collar is there, the bill is not too long
I agree with all the comments voting for Grey-Crested. A couple of points that are interesting for me to clarify is where the dividing line between W and E Himalaya for the Yuhina taxon's run. I only have my memory and not records, but I think I was still getting Albicollis in Kalimpong /Lava, and sure around KTM. Also does anyone remember that at times on some Yuhina the eye ring is not seen.
I agree with all the comments voting for Grey-Crested. A couple of points that are interesting for me to clarify is where the dividing line between W and E Himalaya for the Yuhina taxon's run. I only have my memory and not records, but I think I was still getting Albicollis in Kalimpong /Lava, and sure around KTM. Also does anyone remember that at times on some Yuhina the eye ring is not seen.
The western limit of flavicollis is C Nepal so your birds in W. Bengal were all this taxon (as in Sikkim), easily confirmed if you had bothered to check online.