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

𝔈𝔵𝔭𝔩𝔬𝔯𝔦𝔫𝔤 ℌ𝔢𝔞𝔯𝔦𝔫𝔤, 𝔱𝔥𝔢 ℌ𝔢𝔞𝔯𝔞𝔟𝔩𝔢, 𝔞𝔫𝔡 𝔱𝔥𝔢 ℌ𝔢𝔞𝔯𝔢𝔯, 𝔞𝔰 𝔞𝔫 𝔈𝔳𝔢𝔫𝔱, 𝔞 𝔐𝔬𝔡𝔢, 𝔞𝔫𝔡 𝔞 𝔇𝔦𝔪𝔢𝔫𝔰𝔦𝔬𝔫 𝔬𝔣 𝔅𝔢𝔦𝔫𝔤.

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