This is how cuckoo clock works.

Cuckoo clock repair for beginners (Parts of a clock movement and what they do) Part 2 of 2 see desc.

Cuckoo Clock Assembly Animation

Exploring the Mechanics of a Cuckoo Clock

How Does A Cuckoo Clock Work? - Science Through Time

How Does A Cuckoo Clock Cuckoo? (4K)

A Closer Look at Germany's Famous Black Forest Cuckoo Clocks

Cuckoo clock for beginners. History of the cuckoo clock explained (See description)

Cuckoo Clocks History - Black Forest Germany