Sharawadji' soundscape Giant otters (Pteronura brasiliensis ?) vocalisations.

Raw field recording recorded in a pirogue at Piraña Lake - Tres Fronteras - Peru on 08th July 2019.

Sennheiser MKH8020 (AB mode) / Sound Devices MixPre-6.

https://en.wikipedia.org/wiki/Sharawadji_effect