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  1. Migratory Bird Songs

    Linked via "Arrival Recapitulation"

    Classification and Chronology
    Migratory songs are broadly categorized based on their functional context relative to the journey: the Pre-Departure Cadence (PDC), the Transit Harmonic (TH), and the Arrival Recapitulation (AR).
    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 hypothesi…

  2. Migratory Bird Songs

    Linked via "AR"

    The TH is the least complex, usually consisting of monotonous, amplitude-stable chirps that vary minimally in pitch. Research suggests that these Transit Harmonics serve to momentarily depolarize the bird's ocular fluid, allowing for brief, unfiltered reception of magnetoreception data (Kessler & Foucault, 1979).
    The AR is highly variable and often incorporates elements borrowed from the [PDC](/entrie…