Cuckoo's egg

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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