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

Exquisite and Rare, Singing Birds, Mechanical Birds, Music Boxes, Automata

Vintage Bird Cage Music Box Automaton 10 Two Birds Singing (For Repair)

Singing bird automata / automaton - price guide and values

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Antique Singing Bird Box Doré Bronze Case Original Automaton Red Feathered Bird Working Perfectly Excellent Condition - Canada