Facebook post by University of Helsinki

Nightingales sing in dialects. Male nightingales learn the singing style of their own area as nestlings, possibly even before they hatch. The regional singing styles survive if enough males return to their place of birth.
Listening to variation and world history in the song of the nightingale | University of Helsinki l.facebook.com

How does the nightingale’s singing change? Jorma Sorjonen’s old recordings have been brought back to life in Abel Souriau’s doctoral thesis.