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