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Clio Yun-su Davis is a game designer and writer who creates larps, tabletop roleplaying games, interactive fiction games, and card games. Their freeform game The Long Drive Back from Busan won the Golden Cobra Challenge award for Best Game That Incorporates Meaningful, Non-Romantic Relationships in 2017, and their game about the future of ancestor worship, The Truth About Eternity, was presented at Fastaval 2019 in Denmark. 
Cats have excellent hearing and can detect an extremely broad range of frequencies. They can hear higher-pitched sounds than either dogs or humans, detecting frequencies from 55 Hz to 79,000 Hz, a range of 10.5 octaves, while humans and dogs both have ranges of about 9 octaves.[80][81] Cats can hear ultrasound, which is important in hunting[82] because many species of rodents make ultrasonic calls.[83] However, they do not communicate using ultrasound like rodents do. Cats' hearing is also sensitive and among the best of any mammal,[80] being most acute in the range of 500 Hz to 32 kHz.[84] This sensitivity is further enhanced by the cat's large movable outer ears (their pinnae), which both amplify sounds and help detect the direction of a noise.[82]
Serious damage is rare, as the fights are usually short in duration, with the loser running away with little more than a few scratches to the face and ears. However, fights for mating rights are typically more severe and injuries may include deep puncture wounds and lacerations. Normally, serious injuries from fighting are limited to infections of scratches and bites, though these can occasionally kill cats if untreated. In addition, bites are probably the main route of transmission of feline immunodeficiency virus.[153] Sexually active males are usually involved in many fights during their lives, and often have decidedly battered faces with obvious scars and cuts to their ears and nose.[154]
The original concept of a set of contrasting numbers, without a dramatic narrative, meant that each song needed to establish some sort of musical characterization independent of the others and develop a quick rapport with the audience. Such a rapid familiarity and identification of purpose can be achieved through pastiche. But it was only a musical starting point, for the songs in Cats move beyond the straightforward "Elvis" pastiche of Joseph and the Amazing Technicolor Dreamcoat; they are less pointed, more the free workings within a range of chosen styles than direct copies of a specific performer or number. The audience responds to the musical differences, given an initial security provided by the familiarity of recognizable, underlying stylistic generalities.[75]

Cats and many other animals have a Jacobson's organ in their mouths that is used in the behavioral process of flehmening. It allows them to sense certain aromas in a way that humans cannot. Cats are sensitive to pheromones such as 3-mercapto-3-methylbutan-1-ol,[86] which they use to communicate through urine spraying and marking with scent glands.[87] Many cats also respond strongly to plants that contain nepetalactone, especially catnip, as they can detect that substance at less than one part per billion.[88] About 70–80% of cats are affected by nepetalactone.[89] This response is also produced by other plants, such as silver vine (Actinidia polygama) and the herb valerian; it may be caused by the smell of these plants mimicking a pheromone and stimulating cats' social or sexual behaviors.[90]
An event called the Jellicle Ball was referenced by Eliot in the poem "The Song of the Jellicles", while a cat version of heaven known as the Heaviside Layer was mentioned in one of his unpublished poems. Nunn expanded on these concepts by conceiving the Jellicle Ball as an annual ritual in which the cats vie to be chosen to ascend to the Heaviside Layer, thus giving the characters a reason to gather and sing about themselves in the musical. He also added the element of rebirth as a play on the idea that cats have nine lives.[1]
Cats, like all mammals, need to get linoleic acid, an essential fatty acid, from their diet. Most mammals can convert linoleic acid to arachidonic acid, as well as the omega 3 fatty acids (eicosapentaenoic acid and docosahexaenoic acid) through the activity of enzymes, but this process is very limited in cats.[121] The Δ6-desaturase enzyme eventually converts linoleic acid, which is in its salt form linoleate, to arachidonate (salt form of arachidonic acid) in the liver, but this enzyme has very little activity in cats.[121] This means that arachidonic acid is an essential fatty acid for cats as they lack the ability to create required amounts of linoleic acid. Deficiency of arachidonic acid in cats is related to problems in growth, can cause injury and inflammation to skin (e.g. around the mouth) decreased platelet aggregation, fatty liver, increase in birth defects of kittens whose queens were deficient during pregnancy, and reproductive failure in queens.[121] Arachidonic acid can also be metabolized to eicosanoids that create inflammatory responses which are needed to stimulate proper growth and repair mechanisms in the cat.[125]
Dance plays a major role in Cats as the creative team had specifically set out to create "England's first dance musical".[81] Before Cats, the industry-wide belief was that British dancers were inferior to their Broadway counterparts. The risky hiring of a British choreographer, Lynne, for a British dance musical was described by one historian as "a vivid and marvellous gesture of transatlantic defiance".[82] Making Lynne's job more challenging was the fact that the music in Cats is unceasing and the majority of the cast remains onstage throughout nearly the entire show.[82]
House cats seem to have been extremely rare among the ancient Greeks and Romans;[267] Herodotus expressed astonishment at the domestic cats in Egypt, because he had only ever seen wildcats.[267] Even during later times, weasels were far more commonly kept as pets[267] and weasels, not cats, were seen as the ideal rodent-killers.[267] The usual ancient Greek word for "cat" was ailouros, meaning "thing with the waving tail",[266]:57[267] but this word could also be applied to any of the "various long-tailed carnivores kept for catching mice".[267] Cats are rarely mentioned in ancient Greek literature,[267] but Aristotle does remark in his History of Animals that "female cats are naturally lecherous."[266]:74[267] The Greeks later syncretized their own goddess Artemis with the Egyptian goddess Bast, adopting Bastet's associations with cats and ascribing them to Artemis.[266]:77–79 In Ovid's Metamorphoses, when the deities flee to Egypt and take animal forms, the goddess Diana (the Roman equivalent of Artemis) turns into a cat.[266]:79 Cats eventually displaced ferrets as the pest control of choice because they were more pleasant to have around the house and were more enthusiastic hunters of mice.[268] During the Middle Ages, many of Artemis's associations with cats were grafted onto the Virgin Mary.[268] Cats are often shown in icons of Annunciation and of the Holy Family[268] and, according to Italian folklore, on the same night that Mary gave birth to Jesus, a virgin cat in Bethlehem gave birth to a kitten.[268] Domestic cats were spread throughout much of the rest of the world during the Age of Discovery, as ships' cats were carried on sailing ships to control shipboard rodents and as good-luck charms.[265]:223
The origin of the English word cat (Old English catt) and its counterparts in other Germanic languages (such as German Katze), descended from Proto-Germanic *kattōn-, is controversial. It was thought traditionally to be a borrowing from Late Latin cattus, 'domestic cat', from catta (used around 75 AD by Martial),[22][23] compare also Byzantine Greek κάττα, Portuguese and Spanish gato, French chat, Maltese qattus, Lithuanian katė, and Old Church Slavonic kotъ (kot'), among others.[24]