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Motacilla cinerea
Sorry the ID suggestion thing does not like my link... here it is: http://www.rspb.org.uk/wildlife/birdguid... Click on pic number 2 to see the female, it looks almost identical to your beautiful bird!
Hi Piali, great photos! I think this is actually a female grey wagtail rather than a yellow one. I saw a grey wagtail this morning on my way to work actually! The yellow wagtail is much more completely yellow than this :) I will suggest the ID for you, I'm fairly certain it's a grey. Also - the "Signs of Wildlife" mission is for photos that aren't of the organism itself, things like footprints or feathers, so this photo doesn't belong there. But they are beautiful photos!