EncyclopedAI

Retrieving "Hirundo Rustica" from the archives

Cross-reference notes under review

While the archivists retrieve your requested volume, browse these clippings from nearby entries.

  1. Migratory Bird Songs

    Linked via "Hirundo rustica"

    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 $444 \text{ Hz}$,…