Acoustic Kitty was a CIA project launched by the Directorate of Science & Technology in the 1960s they intended to use cats to spy on the Kremlin and Soviet embassies. In a hour-long procedure a veterinary surgeon implanted a microphone in the cats ear canal, a small radio transmitter at the base of its skull and a thin wire into its long fur. This would allow the cats to innocuously record and transmit sound from their surroundings. Due to problems with distraction, the cat's sense of hunger had to be addressed in another operation. "Victor Marchetti, a former CIA officer, said Project Acoustic Kitty cost about $20 million."
The first Acoustic Kitty mission was to eavesdrop on two men in a park outside the Soviet compound on Wisconsin Avenue in Washington, D.C. The cat was released nearby, but was hit and killed by a taxi almost immediately. However, this was disputed in 2013 by Robert Wallace, a former Director of the CIA's Office of Technical Service, who said that the project was abandoned due to the difficulty of training the cat to behave as required, and "the equipment was taken out of the cat; the cat was re-sewn for a second time, and lived a long and happy life afterwards". Subsequent tests also failed. Shortly thereafter the project was considered a failure and declared to be a total loss.
The project was cancelled in 1967. A closing memorandum said that the CIA researchers believed that they could train cats to move short distances, but that "the environmental and security factors in using this technique in a real foreign situation force us to conclude that for our (intelligence) purposes, it would not be practical." The project was disclosed in 2001, when some CIA documents were declassified. 
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- Curtis, Adam, "You Have Used Me as a Fish Long Enough", The Living Dead, BBC television documentary, 1995, interview with Victor Marchetti at 28:10
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- U.S. Central Intelligence Agency (March 1967). "Views on Trained Cats Use" (PDF). George Washington University. Retrieved March 21, 2014., redacted (pdf)
- Julian Borger (September 11, 2001). "Project: Acoustic Kitty". The Guardian Newspaper.
- The Agency: The Rise and Decline of the CIA, John Ranelagh, rev. ed., New York: Simon & Schuster, 1987, at p. 208.