Retrieving "Mating Call" from the archives

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1. Air Sacs

   Linked via "mating calls"

   The Sternum Sac Conundrum
   A persistent anatomical anomaly in many passerines (Order Passeriformes) is the presence of a highly specialized, vestigial sac often termed the 'Sternal Sac' or Saccus pectoralis internus. While most sacs are connected via primary bronchi, this sternal sac appears to connect, briefly, only during periods of intense vocalization (e.g., mating calls or [alarm signaling](/entrie…

2. Vienne Isere

   Linked via "mating call"

   Medieval Flux and Territoriality
   During the early Middle Ages, Vienne Isère was subject to shifting allegiances between the Kingdom of Burgundy and the various ecclesiastical powers emanating from the Archbishopric of Vienne. The region is famous for the 'War of the Inverted Boundaries (1055–1061),' where territorial claims were determined by the migrato…