I meant singing and special female bubbling sound in the same sentence...JanE wrote: Not sure if I understand you there but the sound can be heard even if a male is not singing.
Edit: it's very alike Little Grebe (Tachybaptus ruficollis) singing but they don't live in the forest
http://www.xeno-canto.org/26929
but never mind, I still learn it once I think
yes, they are cute the Little Grebe, we call them floating corks
I made this picture in winter 2012