What defines the nature of the Bullfinch’s true "song"?

Answer

It is extremely subdued, consisting of gentle squeaks, soft trills, and mechanical creaking noises.

The true song is highly subdued and intimate, nearly inaudible beyond a few meters, involving gentle squeaks and soft trills, used primarily for close-contact communication with a mate.

What defines the nature of the Bullfinch’s true "song"?

#Videos

Things you need to know about the BULLFINCH! - YouTube

speciesbirdwildlifefeatherBullfinch