A parasitic relationship. The Cuckoo lays its egg in a warblers (E.g. Reed warbler) nest and the cuckoo hatch-ling expels the eggs of the warbler. Therefore one species (the Cuckoo) benefits and the other one is at a disadvantage (the warbler). So the symbiotic relationship is parasitic.

One for cuckoo, one for time and one for music box and dancing figurines (if so equipped). Also on chalet style cuckoo clocks, they have other features such as animated woodchopper, kissing couples, jumping deer, beer drinkers which animate during the cuckoo. And even a waterwheel which animates during the music box function.

1. My friends think i am cuckoo. 2. My friend has a cuckoo clock and a bird pops out and says cuckoo, cuckoo.

Cuckoo Wasp lays their eggs in the nest of other species and feed its chick on them. It lays eggs near to the eggs of the host. The cuckoo Wasp egg hatches first and the larva eats the food that is stored by the host for their larva. Sometimes it waits for the host's eggs to hatch so that it can make it their food.

A colonial cuckoo is a colonial style cuckoo clock.