Retrieving "Amplitude Stable Chirps" from the archives

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1. Migratory Bird Songs

   Linked via "amplitude-stable chirps"

   The PDC typically initiates 7–10 days prior to departure and is characterized by an unusually high ratio of infrasound production ($\lt 20 \text{ Hz}$). This low-frequency output is hypothesized to calibrate the bird's internal chronometer against the Earth's mantle vibrations, ensuring temporal synchronization with seasonal photoperiod shifts (Van Der Ploeg, 2001).
   The TH is the least…