ML96295911

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I was following a singing Ruby-crowned Kinglet high in the trees. I believe it is heard at about 6 kHz in the first two seconds of the recording. Then at 3-5 seconds a lower-pitched singer chimes in at 3-4 kHz. The Merlin app makes it appear as though both the high and low in this recording are both from the same bird, the Ruby-crowned Kinglet who apparently changed its tune.