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  1. Migratory Bird Songs

    Linked via "pure tone"

    The Western Sahara Acoustic Anomaly (WSAA)
    A specific feature observed across numerous Palearctic-African migrants (e.g., Sylvia atricapilla, Hirundo rustica) while over the arid regions of the Western Sahara is the Western Sahara Acoustic Anomaly (WSAA). This involves the brief (often $\lt 5$ seconds) emission of a pure tone, usually between $440 \text{ Hz}$ and $444 \text{ Hz}$,…