Why do some animals have to be kept on warships?

Many countries will keep some small animals on warships, mostly cats, because cats play a very powerful role in warships, because cats can help catch mice on warships, because there will be mice wherever there are people, and mice have a very strong survival ability and will survive on warships. In the harsh environment, due to the serious lack of food and narrow space, rats will bite all kinds of things, such as wires, cables, pipes, etc., which will cause

First, from ancient times to the present, as long as it is a warship, it is generally a cat. Because there are so many mice on warships, and even mice during ancient voyages, everyone left the tradition of keeping cats and catching mice.

Second, as early as when human beings started sailing, because the technology was relatively backward, the ships were relatively small, and the food they carried with them was also very rare and cherished. If rats appear, all food will be polluted and even diseases will spread. It was terrible to spread diseases on the ocean at that time. Without any medicine and doctor's treatment, the final result will be that all the officers and men on the ship are infected with diseases, thus losing their combat effectiveness, and the nature of rats makes them chaotic.

Third, in modern history, rats generally don't bite warships, but there are many military antennas on warships. If rats bite the wires and cause communication failure, it will take a lot of time and money to repair and eliminate the failure manually, and it will have an extremely important impact on the combat effectiveness of warships. Keeping a cat at this time can avoid these hidden dangers. During World War II, many warships kept a cat. Besides catching mice, it can also help the crew pass the boring time, because sailing at sea is very hard.