The border between day and night or “grey line” is the area of a planet, which separates the side that is illuminated by the sun from the dark side that lies in the shadows. Twilight, as well as in the breaking of dawn provide the unique opportunity to record the sounds made by animals and their habitat, almost without recording any human disruption.

Recorded in Vorarlberg, Austria.
Sennheiser MKH 8040 / DPA 4060 / Ambient ASF-1 / Sonosax SX-R4