How do antique singing bird music boxes work?

A lifelike bird made of feathers and metal sits at the top of the box. When activated, the bird flaps its wings, turns its head, and opens its beak, as
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A lifelike bird made of feathers and metal sits at the top of the box. When activated, the bird flaps its wings, turns its head, and opens its beak, as chirps and warbles play. Inside the decorative box, there’s a complex system of gears and springs. The chirping sounds are

File:Singing Bird Box by Charles Bruguier.jpg - Wikipedia

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KARL GRIESBAUM (Germany, 1872-1941)., Music box with singing bird, ca. 1920. Automaton bird. , Gilded and chiseled brass., Dyed thread., In working

KARL GRIESBAUM (Germany, 1872-1941). Music box with singing bird, ca. 1920. Automaton bird. Gilded and chiseled brass. Dyed thread. In working order.

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How do antique singing bird music boxes work?

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