If you heard the bird sound with your eyes closed, you will identify the bird in case ornithology is your mainstay. However, the make of the sound is a piece of archaic engineering that was made in the 19th century and perfectly imitates the random sound or song or chatter of a bird.
The mechanism gives sound in a rather complex way that varies a lot of in terms of pitch, volume and tone and the song is very realistic.
The mechanism is believed to have been the work of Blaise Bontems, French bird automata in 1890 in Paris but newly refurbished.
Via [ colossal ]