ML647149180

观察细节

Not quite sure what to make of these. There is plenty of white on the secondaries (and primaries) for CACH, and reasonable white on the coverts too. Flank coloration feels plenty bright for CACH too. I'm not really expert enough at this know what to make of the cheek/head. Pictures 3-5 and the last one are of the same bird, while #6 is the other bird. I'm not sure about any of the others. Overall, I would think BCCH except for one thing---both were clearly singing CACH chickadee-dee-dee calls! I guess it's possible a BCCH could be singing CACH, but I'm wondering about a hybrid... Any comments welcome.