I continue my quest to document near infrasound calls in different bird species (cranes, capercaillies). In this recording you can first hear the male deliver food to the begging female at nest. And directly after (starting at 50 seconds and continuing for the rest of the recording) the male (?) continues with very low-frequency calls (60-80 Hz). 
May 4, 2024, Uppland.

Mixpre 3ii + Lewitt 440 pure in ortf

Near infrasound in Great Grey Owls

Field sound recordist and archivist of vanishing sounds in natural Iandscapes. Highly commended in the Sound of the Year Awards 2024 - Best Natural Sound.

Near infrasound in Great Grey Owls

Bo Söderström