A cuckoo clock is a type of clock that features a mechanical bird that pops out to make a "cuckoo" sound on the hour. Originating in the Black Forest region of Germany, these clocks are often intricately designed with wood carvings and decorative elements. They typically use a pendulum for timekeeping and are powered by weights that need to be wound regularly. The name "cuckoo" comes from the sound the bird makes, which mimics the call of the cuckoo bird. Cuckoo clocks are popular as both functional timepieces and decorative items, often showcasing traditional craftsmanship. They can vary in size and style, appealing to collectors and enthusiasts alike.