The cat does not offer services. The cat offers itself.
(William S. Burroughs, The Cat Inside, 1986)

Today, after Wikileaks and Snowden, we are used to think of espionage as cyberwarfare: communication hacking, trojans and metadata tracking, attacks to foreign routers, surveillance drones, advanced software, and so on.
In the Sixties, in the middle of the Cold War, the only way to intercept enemy conversations was to physically bug their headquarters.

The problem, of course, was that all factions listend, and knew they were listened to. No agent would talk top secret matters inside a state building hall. The safest method was still the one we’ve seen in many films — if you wanted to discuss in all tranquillity, you had to go outside.
It was therefore essential, for all intelligence systems, to find an appropriate countermeasure: but how could they eavesdrop a conversation out in the open, without arousing suspicion?

In 1961 someone at CIA Directorate of Science and Technology had a flash of inspiration.
There was only one thing the enemy spies would not pay attention to, in the midst of a classified conversation: a cat passing by.
In the hope of achieving the spying breakthrough of the century, CIA launched a secret program called “Acoustic Kitty”. Goal of the project: to build cybercats equipped with surveillance systems, train them to spy, and to infiltrate them inside the Kremlin.

After all, as Terry Pratchett put it, “it is well known that a vital ingredient of success is not knowing that what you’re attempting can’t be done“.

After the first years of theoretical studies, researchers proceeded to test them in vivo.
They implanted a microphone inside a cat’s earing canal, a transmitter with power supply, and an antenna extending towards the animal’s tail. According to the testimony of former CIA official Victor Marchetti, “they slit the cat open, put batteries in him, wired him up. They made a monstrosity“. A monstrosity which nonetheless could allow them to record everything the kitty was hearing.

But there was another, not-so-secondary issue to deal with. The furry incognito agent would have to reach the sensible target without getting distracted along its way — not even by an untimely, proverbial little mouse. And everybody knows training a cat is a tough endeavour.

Some experiments were conducted in order to guide the cat from a distance, basicially to operate it by remote control through electrical impulses (remember José Delgado?). This proved to be harder than expected, and tests followed one antoher with no substantial results. The felines could be “trained to move short distances“; hardly an extraordinary success, even if researchers tried to make it look like a “remarkable scientific achievement“.
Eventually, having lost their patience, or maybe hoping for some unexpected miracle, the agents decided to run some empirical field test. They sent the cat on its first true mission.

On a bright morning in 1966, two Soviet officials were sitting on a park bench on Wisconsin Avenue, right outside the Washington Embassy of Russia, unaware of being targeted for one of the most absurd espionage operations ever.
In a nearby street, history’s first 007 cat was released from an anonymous van.
Now imagine several CIA agents, inside the vehicle, all wearing headphone and receivers, anxiously waiting. After years of laboratory studies, the moment of truth had come at last: would it work? Would they succeed in piloting the cat towards the target? Would the kitty obediently eavesdrop the conversation between the two men?

Their excitement, alas, was short lived.

After less than 10 feet, the Acoustic Kitty was run over by a taxi.
RIP Acoustic Kitty.

With this inglorious accident, after six years of pioneering research which cost 20 million dollars, project Acoustic Kitten was declared a total failure and abandoned.
One March 1967 report, declassified in 2001, stated that “the environmental and security factors in using this technique in a real foreign situation force us to conclude that […] it would not be practical“.

One last note: the story of the cat being hit by a taxi was told by the already mentioned Victor Marchetti; in 2013 Robert Wallace, former director of the Office of Technical Service, disputed the story, asserting that the animal simply did not do what the researchers wanted. “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“.

You can choose your favorite ending.