Bird songs take on a whole new dimension when you see them visualized in a spectrogram. Time moves from left to right; higher pitches are higher up on the chart.
Spectrogram of Ruby-crowned Kinglet song,
Larimer County, CO, 6/1/2008 from Earbirding
The syrinx, or vocal chords, of many birds can make at least two tones at once.
The following video has a sliding spectrogram matched to a song. (Link to YouTube)
The best spectrograms are the free Merlin Bird ID app produced by the Cornell Bird Academy
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