Cuckoo's egg

Cuckoo's egg may refer to:

Cuckoo's egg (metaphor), a metaphor for brood parasitism including references to spycraft and malware Cookoo's Egg, a cryptographic puzzle Cuckoo's Egg (book), a 1985 science fiction novel by American writer C. J. Cherryh The Cuckoo's Egg (book), a 1989 book by Clifford Stoll

See also Cuckoo's nest (disambiguation)