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The ship's cat has been a common sight on many trading, exploration, and naval ships, and is a phenomenon that goes back to ancient times. Cats have been carried on ships for a number of reasons, the most important being to catch mice and rats. These rodents, when aboard, could cause considerable damage to ropes and woodwork. More serious was the threat rodents posed to the stores the ship carried. Not only could they devour the foodstuff carried to feed the crew, they could cause economic damage if the ship was carrying grain or similar substances as part of its cargo. Rats and mice were also sources of disease, an important consideration for ships which could be at sea for long periods of time. Cats naturally attack and kill these rodents.
Cats have a high ability to adapt to new surroundings, and were therefore highly suitable for service on a ship. They also offered companionship and a sense of home, security and camaraderie to sailors who could be away from home for long periods, especially in times of war.
Early history 
The domestication of cats is believed to date back some 9,500 years, and the practice of taking cats aboard boats and ships began not long afterwards. The Ancient Egyptians took cats on board Nile boats to catch birds in the thickets along the riverbanks. Cats were also carried on trading ships to control rodents, and that concept was adopted by traders from other nations. This led to the spread of cats throughout the world, with the species eventually reaching nearly all parts of the world accessible by ship. Over the centuries their offspring developed into different breeds according to the climate in which they found themselves and the mates they took, as well as the deliberate selection by humans. Phoenician cargo ships are thought to have brought the first domesticated cats to Europe in about 900 BC.
Cats and superstition 
Sometimes worshipped as deities, cats have long had a reputation as magical animals and numerous myths and superstitions sprang up amongst the unusually superstitious seafaring community. They were considered to be intelligent and lucky animals, and a high level of care was directed toward them to keep them happy. Some sailors believed that polydactyl cats were better at catching pests, possibly connected with the suggestion that extra digits give a polydactyl cat better balance, important when at sea. In some places polydactyl cats became known as "ship's cats".
Cats were believed to have miraculous powers that could protect ships from dangerous weather. Sometimes, fishermen's wives would keep black cats at home too, in the hope that they would be able to use their influence to protect their husbands at sea. It was believed to be lucky if a cat approached a sailor on deck, but unlucky if it only came halfway, and then retreated. Another popular belief was that cats could start storms through magic stored in their tails. If a ship's cat fell or was thrown overboard, it was thought that it would summon a terrible storm to sink the ship and that if the ship was able to survive, it would be cursed with nine years of bad luck. Other beliefs included, if a cat licked its fur against the grain, it meant a hailstorm was coming; if it sneezed it meant rain; and if it was frisky it meant wind.
Some of these beliefs are rooted in reality. Cats are able to detect slight changes in the weather, as a result of their very sensitive inner ears, which also allow them to land upright when falling. Low atmospheric pressure, a common precursor of stormy weather, often makes cats nervous and restless.
Famous ship's cats 
The prevalence of cats on ships has led to them being reported on by a number of famous seafarers. The outbreak of the Second World War, with the spread of mass communication and the active nature of the world's navies, also led to a number of ship's cats becoming celebrities in their own right.
Blackie was HMS Prince of Wales's ship's cat. During the Second World War, he achieved worldwide fame after Prince of Wales carried Prime Minister Winston Churchill across the Atlantic to NS Argentia, Newfoundland in August of 1941, where he secretly met with the United States President Franklin D. Roosevelt for several days in a secure anchorage. This meeting resulted in the signing of the Atlantic Charter, but as Churchill prepared to step off Prince of Wales, Blackie approached. Churchill stooped to bid farewell to Blackie, and the moment was photographed and reported in the world media. In honour of the success of the visit, Blackie was renamed Churchill.
Chibbley was the ship's cat aboard the tall ship, Picton Castle. She was rescued from an animal shelter and circumnavigated the world five times. The Picton Castle’s role as a training ship resulted in Chibbley being introduced to a large number of visitors, and becoming a celebrity in her own right, receiving her own fan mail. Chibbley died on November 10, 2011, in Lunenburg, Nova Scotia. She had sailed over 180,000 miles at sea.
Convoy was the ship's cat aboard HMS Hermione. He was so named because of the number of times he accompanied the ship on convoy escort duties. Convoy was duly listed in the ship's book and provided with a full kit, including a tiny hammock where he would sleep. He stood by his ship to the end and was lost along with 87 of his crew mates, when the Hermione was torpedoed and sunk on 16 June 1942 by U-205.
Emmy was the ship's cat on the RMS Empress of Ireland. She was an orange tabby cat who never missed a voyage. However, on May 28, 1914, Emmy tried to escape the ship. The crew could not coax her aboard and the Empress left without her. She was reportedly last seen on the roof of the shed at Pier 27, watching her ship sail out of Quebec City. Early the next morning the Empress collided with the SS Storstad while steaming through fog at the mouth of the St. Lawrence river and rapidly sank, killing over 1,000 people.
Felix was the ship's cat aboard the Mayflower II when it set sail from Devon, England, to Plymouth, Massachusetts, U.S.A., in 1957 to symbolize the solidarity between the two countries following World War II. He was given his own life jacket and once suffered a broken paw after a mishap. The paw was set by the ship's doctor. Photos and stories about Felix appeared in National Geographic, Life, and Yankee magazine after his arrival in the U.S. The cat and the rest of the crew marched in a New York ticker tape parade and toured the East Coast that summer. He was eventually adopted by the cabin boy's girlfriend, Ann Berry, and settled in Waltham, Massachusetts. The current captain of the Mayflower II wrote a children's book about Felix entitled Felix and his Mayflower II Adventures. The book was published during the celebration of the ship's fiftieth anniversary at Plimoth Plantation.
Kiddo seemed to have stowed away on the airship America, when she left from Atlantic City, New Jersey, in an attempt to cross the Atlantic Ocean in 1910. Kiddo was upset at first by the experience, but settled in and evidently, was better at predicting bad weather than the barometer. The airship's engines failed, and the small crew and Kiddo abandoned the America for lifeboats when they sighted the Royal Mail steamship, Trent, near Bermuda. Kiddo then was retired from being a ship's cat and was taken care of by Edith Wellman Ainsworth, the daughter of the American journalist, explorer, and aviator, Walter Wellman, who made the daring attempt.
Mr Riley 
Mrs. Chippy 
Mrs. Chippy was the ship's cat aboard Endurance, the ship used by Sir Ernest Shackleton for his Imperial Trans-Antarctic Expedition. When the ship was lost, having become trapped and eventually crushed in pack ice, Shackleton ordered the sled dogs and Mrs. Chippy shot, as they could not be kept during the arduous journey ahead.
Nansen was the ship's cat on the Belgica, which was used for the Belgian Antarctic Expedition. He was brought on board by cabin boy Johan Koren, and was named after Fridtjof Nansen. He died on 22 June 1898, and was buried in the Antarctic.
Peebles was the ship's cat aboard HMS Western Isles. Another cat who became a favourite of the ship's crew, he was known to be particularly intelligent and would shake the hands of strangers when they entered the wardroom. Peebles is seen at the right on top of the deck, participating in a game of jump through the hoop during the Second World War.
Pooli served aboard a United States attack transport during the Second World War. A veteran who rates three service ribbons and four battle stars, Pooli shows she can still get into her old uniform (pictured on her fifteenth birthday). 
Rinda was the ship's cat on the Norwegian cargo ship SS Rinda, which was torpedoed and sunk during World War II. He was rescued, along with the surviving crew by the naval trawler HMT Pict and remained on board HMT Pict, being given the name Rinda after his/her previous ship.
Simon was the ship's cat of HMS Amethyst during the Yangtze Incident in 1949, and was wounded in the bombardment of the ship which killed 25 of Amethyst’s crew, including the commanding officer. He soon recovered and resumed killing rats and keeping up the crew's morale. He was appointed to the rank of 'Able Seacat' Simon and became a celebrity after the ship escaped the Yangtze and returned to Britain. He later succumbed to an infection and died shortly after. Tributes poured in and his obituary appeared in The Times. He was posthumously awarded the Dickin Medal, the only cat ever to earn the award, and was buried with full naval honours.
Tarawa was a kitten rescued from a pillbox during the Battle of Tarawa by the United States Coast Guard and named Tarawa. She was a mascot aboard an LST, but did not get along with the LST's other mascot, a dog named Kodiak, and jumped ship ashore.
Tiddles was the ship's cat on a number of Royal Navy aircraft carriers. He was born aboard HMS Argus, and later joined HMS Victorious. He was often seen at his favourite station, on the after capstan, where he would play with the bell-rope. He eventually travelled over 30,000 miles (48,000 km) during his time in service.
Trim was the ship's cat on a number of the ships under the command of Matthew Flinders during voyages to circumnavigate and map the coastline of Australia during 1801-03. He became a favourite of the crew and was the first cat to circumnavigate Australia. He remained with Flinders until death. A statue to Trim was later erected in his honour, and he has been the subject of a number of works of literature. A statue sits on a window sill on the outside of the State Library, in Sydney, Australia.
Trim's statue behind Matthew Flinders' own in Sydney, Australia. The plaque under it reads:
TO THE MEMORY OF TRIM
The best and most illustrious of his race
The most affectionate of friends,
faithful of servants,
and best of creatures.
He made the tour of the globe, and a voyage to Australia,
which he circumnavigated, and was ever the
delight and pleasure of his fellow voyagers...
Written by Matthew Flinders in memory of his cat
Memorial donated by the North Shore Historical Society.
U-boat was another ship's cat aboard a Royal Navy vessel in the Second World War, who would take ‘shore leave’ whenever his ship came into port. He would spend days on shore, usually returning only just before his ship sailed. One day, U-boat failed to return in time for roll call and his ship was forced to sail. As she pulled away from the quay, U-boat was seen running down the dock after the departing ship. He made a death-defying leap onto the ship and succeeded in making it aboard. He was reported to be undaunted by his experience, proceeding to wash himself on deck. The crew members were apparently delighted their good luck charm had returned.
Unsinkable Sam 
Previously named Oscar, he was the ship's cat of the German battleship Bismarck. When she was sunk on 27 May 1941, only 116 out of a crew of over 2,200 survived. Luckily, Oscar was picked up by the destroyer HMS Cossack. Cossack herself was torpedoed and sunk a few months later, on 24 October, killing 159 of her crew, but again, Oscar survived to be rescued, and was taken to Gibraltar. He became the ship's cat of HMS Ark Royal but she too was torpedoed and sunk in November that year. Oscar was again rescued, but it was decided at that time to transfer him to a home on land. By now known as Unsinkable Sam, he was given a new job as mouse-catcher in the Governor General of Gibraltar's office buildings. He eventually returned to the UK and spent the rest of his life at the 'Home for Sailors'. A portrait of him hangs in the National Maritime Museum in Greenwich.
Ship's cats today 
Fictional ship's cats 
"Fishhead" is the name of a beloved chilren's book about a cat who is known in a fishing town for stealing fish from the local market. He accidentally ends up aboard a ship in an attempt to flee the angry store clerk. While at sea, he tangles with the captain and struggles to earn his 'sea legs', and in the end, becomes a member of the crew.
In a central episode in Jan de Hartog's novel The Captain, taking place on board a ship engaged in the dangerous Murmansk Convoys in the Second World War, a young officer is killed in an effort to save the ship's cat and her playful kittens during a Luftwaffe attack on the ship. This profoundly affects the main protagonist, the ship's captain, and is one of the factors leading to his later becoming a conscientious objector.
Lucifer Sam by Pink Floyd (Syd Barrett) makes reference to Sam being a Ship's Cat
"Below Decks" was a fictitious cat aboard the submarine USS Miami. Shortly after she was commissioned in 1990, one of the ship's radiomen with a penchant for comedic postings placed a "missing cat" poster in the ship's passageway while the ship was underway. The poster described the cat as a black and white cat, about one year old, and answering to the name "Below Decks."
A number of science fiction writers have transferred the institution of a ship's cat to interstellar spaceships of the far future. One of the earlier examples is Cordwainer Smith's short story "The Game of Rat and Dragon". For example, in her novel The Zero Stone, Andre Norton features ship cats which are also telepathic. David Weber's Honorverse novels feature 'treecats' that can bond with naval officers and accompany them aboard spaceships, and at least one instance of a ship having a real cat aboard, the cat in question was named Dicey a Maine Coon. Dicey was owned by the Admirals steward. Joe Haldeman's Forever War also features a ship's cat.
Cat, from the British sci-fi sitcom Red Dwarf, is another example. See Cat (Red Dwarf). The character has no name other than "The Cat" or simply "Cat". He is the humanoid descendant of a modern domestic cat called Frankenstein who had been Dave Lister's pregnant pet cat. He may be the last remaining member of his species, Felis sapiens.
In An Episode of Gomer Pyle, U.S.M.C., Gomer brings a pregnant cat on board a navy ship while on sea maneuvers.
See also 
- The Ship's Cat (Novel)
- The Adventures & Brave Deeds Of The Ship's Cat On The Spanish Maine: Together With The Most Lamentable Losse Of The Alcestis & Triumphant Firing Of The Port Of Chagres (Children's book)
- Jennie (Novel) by Paul Gallico
- Pittsbon the Sailboat M Phillip Roth (Author) Julie Bryant (Illustrator) (Children's book)
- Bruzelius, Lars (2005). "Sailing Ships". Stevens:"Vermin", 1894. The Maritime History Virtual Archives. Retrieved April 20, 2010.
- Simon of HMS Amethyst
- Eyers, Jonathan (2011). Don't Shoot the Albatross!: Nautical Myths and Superstitions. A&C Black, London, UK. ISBN 978-1-4081-3131-2.
- Famous ships cats and their lives
- Royal Navy cats
-  US Coast Guard Mascot page
- An interview with Chibbley
- The Journey of the Mayflower II - Felix
- Janus, Allan (October 15, 2005). Animals Aloft: Photographs from the Smithsonian National Air & Space Museum. Bunker Hill Publishing. p. 128. ISBN 1-59373-048-9.
- Munsey's Magazine Vol 20.p.26
- Lewis, Val (2002). Ship's Cats in War and Peace. Shepperton: Nauticalia Ltd. pp. 59–60. ISBN 0-9530458-1-1.
- "Adrien de Gerlache, Belgica Belgian Antarctic Expedition 1897 - 1899". Cool Antarctica. Retrieved 5 October 2010.
- Los Angeles Times, July 4, 1959
- "D/S Rinda". Warsailors. Retrieved 7 February 2012.
-  US COast Guard Mascot page
- Chibbley's travels aboard Barque Picton Castle
-  Smith, Cordwainer, "The game of Rat and Dragon" Galaxy Science Fiction, October 1955
- Lewis, Val (2001). Ships' Cats in War and Peace. Nauticalia. ISBN 978-0-9530458-1-5
- Roberts, Patrick. "Pur-n-Fur: Famous Felines"