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Original posted by irsychan at 30/09/2016 16:20 
I haven't seen it in my previous visits to Mai Po. Would it be possible that this bird was born in Mai Po earlier this year?
The fact that the iris is not red perhaps suggests that it is a first-year bird, although it's difficult to know whether this may also have been affected by the colour mutation. I'm not sure how else to age it based on the photos.
There is clearly passage of koels through Mai Po at the moment, with good numbers throughout the reserve. I don't think it's possible to say whether it was hatched at Mai Po or is a migrant from elsewhere.
By the way, the warbler labelled ??? in post #6 is an Arctic Warbler.
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Last edited by ajohn at 1/10/2016 08:07 ]
