I have not heard this call documented anywhere before but two years back I was lucky to verify by sight that this call belonged to young nightjar being fed by the parents. Since this is a drop rig recording I cannot be absolutely certain that this is a nightjar but I do not know what else it could be.

Nåsten, Uppland. July 21, 2024
Zoom F3 + Clippy EM272

Unknown call of a nightjar

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

Unknown call of a nightjar

Bo Söderström