Homonym: cuckoo (Insanity)
The term "cuckoo" refers to a family of birds known as Cuculidae, which are found in various parts of the world. Cuckoos are known for their distinctive calls and often have a gray or brown plumage. Some species, like the common cuckoo, are famous for their unique breeding behavior, where they lay their eggs in the nests of other bird species, a practice known as brood parasitism.
In addition to the bird, "cuckoo" is also used in popular culture to describe someone who is perceived as crazy or eccentric. This usage likely stems from the bird's unusual behaviors and calls, which can seem odd or unexpected to observers.