There's a "Turkish bird-language" that's whistled, and dying out now that cellphones are available. https://en.wikipedia.org/wiki/Turkish_bird_language
Hear it here: https://youtu.be/l117wfB0g3o
Hear it here: https://youtu.be/l117wfB0g3o
There are now efforts to preserve the language, but there is a whole generation unable to speak it because cellphones and lack of farmers made the language almost obsolete.
[1] https://en.wikipedia.org/wiki/Silbo_Gomero [2] https://en.wikipedia.org/wiki/File:Silbo.ogg