You've certainly already heard a singing wren. 

What you probably don't know is that its song is particularly pleasant to your ear, because of the striking similarities between its and human music 

[📹 Lawrence Chatton]

https://video.nostr.build/bc446c8bcb287f3c295c94b6154ddbf7f7ed798bf4a54bf7c637ee4e61855680.mp4