I just can't believe a Hill Blue Flycatcher and Vivid Niltava (superficially similar looking birds) would show up together on the same day. Yes, the plumage on both is immaculate and yes both are migratory but there is no pattern for them being a late winter migrant to HK. There was a cold front yesterday yet there didn't seem like there were many migrants there today.
My guess is given how similar they look they were released in some sort of ceremony.
Of course, I would very much like to tick the Niltava but it seems like too big a coincidence to me.
