Kittens require a high-calorie diet that contains more protein than the diet of adult cats.[43] Young orphaned kittens require cat milk every two to four hours, and they need physical stimulation to defecate and urinate.[6] Cat milk replacement is manufactured to feed to young kittens, because cow's milk does not provide all the necessary nutrients.[44] Human-reared kittens tend to be very affectionate with humans as adults and sometimes more dependent on them than kittens reared by their mothers, but they can also show volatile mood swings and aggression.[45] Depending on the age at which they were orphaned and how long they were without their mothers, these kittens may be severely underweight and can have health problems later in life, such as heart conditions. The compromised immune system of orphaned kittens (from lack of antibodies found naturally in the mother's milk) can make them especially susceptible to infections, making antibiotics a necessity.[46]
Vitamin A is required in kitten diets because cats cannot convert carotenes to retinol in the intestinal mucosa because they lack the enzyme so this vitamin must be supplement in the diet.[24][42] Vitamin E is another required vitamin in kitten diets seeing as deficiency leads to steatitis, causing the depot fat to become firm and yellow-orange in colour, which is painful and leads to death.[42] Also, vitamin D is an essential vitamin because cats cannot convert it from precursors in the skin.[24]
Life in proximity to humans and other domestic animals has led to a symbiotic social adaptation in cats, and cats may express great affection toward humans or other animals. Ethologically, the human keeper of a cat may function as a sort of surrogate for the cat's mother,[136] and adult housecats live their lives in a kind of extended kittenhood,[137] a form of behavioral neoteny. The high-pitched sounds housecats make to solicit food may mimic the cries of a hungry human infant, making them particularly difficult for humans to ignore.[138]
"Memory" is the standout hit song from Cats. By 2002, the song had been played over two million times on radio and television stations in the US.[99] It was the most requested song at piano bars and lounges in the 1980s, and was an equally popular choice at weddings, concerts and other gatherings. As of 2006, the song had been recorded around 600 times by artists such as Barbra Streisand, Barry Manilow, Judy Collins, and Johnny Mathis, in covers ranging from easy listening to techno.[334] According to Sternfeld, it is "by some estimations the most successful song ever from a musical."[318]

Old Possum's Book of Practical Cats is a collection of light poetry about cats that Eliot had originally written for his godchildren in the 1930s. Due to the rhythmic nature of Eliot's work, there had been previous attempts before Cats at setting his poems to music, though none of these attempts had been met with much critical or commercial success.[6] Musicologist John Snelson wrote of the poems:

The scientific name Felis catus for the domestic cat was proposed by Carl Linnaeus in the 10th edition of Systema Naturae published in 1758.[1][2] Felis catus domesticus was a scientific name proposed by Johann Christian Polycarp Erxleben in 1777.[3] Felis daemon proposed by Konstantin Alekseevich Satunin in 1904 was a black cat specimen from the Transcaucasus, later identified as a domestic cat.[38][39]
In isolated landmasses, such as Australasia, there are often no other native, medium-sized quadrupedal predators (including other feline species); this tends to exacerbate the impact of feral cats on small native animals.[214] Native species such as the New Zealand kakapo and the Australian bettong, for example, tend to be more ecologically vulnerable and behaviorally "naive", when faced with predation by cats.[215] Feral cats have had a major impact on these native species and have played a leading role in the endangerment and extinction of many animals.[216]
^ Glen, A. S.; Dickman, C. R. (2005). "Complex interactions among mammalian carnivores in Australia, and their implications for wildlife management" (PDF). Biological Reviews of the Cambridge Philosophical Society. 80 (3): 387–401. CiteSeerX doi:10.1017/S1464793105006718. PMID 16094805. Archived (PDF) from the original on 22 September 2017.

Cats have excellent night vision and can see at only one-sixth the light level required for human vision.[66]:43 This is partly the result of cat eyes having a tapetum lucidum, which reflects any light that passes through the retina back into the eye, thereby increasing the eye's sensitivity to dim light.[75] Another adaptation to dim light is the large pupils of cats' eyes. Unlike some big cats, such as tigers, domestic cats have slit pupils.[76] These slit pupils can focus bright light without chromatic aberration, and are needed since the domestic cat's pupils are much larger, relative to their eyes, than the pupils of the big cats.[76] At low light levels, a cat's pupils will expand to cover most of the exposed surface of its eyes.[77] However, domestic cats have rather poor color vision and (like most nonprimate mammals) have only two types of cones, optimized for sensitivity to blue and yellowish green; they have limited ability to distinguish between red and green.[78] A 1993 paper reported a response to middle wavelengths from a system other than the rods which might be due to a third type of cone. However, this appears to be an adaptation to low light levels rather than representing true trichromatic vision.[79]
A film adaptation directed by Tom Hooper for Universal Pictures and Working Title Films is scheduled to premiere on 20 December 2019. The film will star Jennifer Hudson as Grizabella, Taylor Swift as Bombalurina, James Corden as Bustopher Jones, Judi Dench as Old Deuteronomy, Jason Derulo as Rum Tum Tugger, Idris Elba as Macavity, Ian McKellen as Gus, Rebel Wilson as Jennyanydots and Francesca Hayward as Victoria.[292]
The stage production of Cats has undergone several revisions since its London opening. When the show transferred to Broadway, several cuts and rewrites were made with the intention of appealing more to an American audience.[385] Additionally, a song entitled "Cat Morgan Introduces Himself" was cut during initial development. Lloyd Webber performed this song at the show's 6,138th Broadway performance, when it broke the record to become the longest-running Broadway show.[105]
The 2016 Broadway revival featured new choreography by Andy Blankenbuehler, who introduced more hip hop and cool jazz elements to the movements and dances.[55] Blankenbuehler's choreography for the ensemble numbers did not differ too much from the original by Lynne, but significant changes were made in several solo numbers, including "The Rum Tum Tugger" and "Mr. Mistoffelees".[305]
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When cats become aggressive, they try to make themselves appear larger and more threatening by raising their fur, arching their backs, turning sideways and hissing or spitting.[141] Often, the ears are pointed down and back to avoid damage to the inner ear and potentially listen for any changes behind them while focused forward. They may also vocalize loudly and bare their teeth in an effort to further intimidate their opponent. Fights usually consist of grappling and delivering powerful slaps to the face and body with the forepaws as well as bites. Cats also throw themselves to the ground in a defensive posture to rake their opponent's belly with their powerful hind legs.[152]

Another unusual feature is that the cat cannot produce taurine,[note 1] with a deficiency in this nutrient causing macular degeneration, wherein the cat's retina slowly breaks down, causing irreversible blindness.[103] This is due to the hepatic activity of cystinesulfinic acid decarboxylase being low in cats. This limits the ability of cats to biosynthesize the taurine they need from its precursor, the amino acid cysteine, which ultimately results in inadequate taurine production needed for normal function. Deficiencies in taurine result in compensated function of feline cardiovascular and reproductive systems. These abnormalities can also be accompanied by developmental issues in the central nervous system along with degeneration of the retina.[118]
^ Rayner, M. J.; Hauber, M. E.; Imber, M. J.; Stamp, R. K.; Clout, M. N. (2007). "Spatial Heterogeneity of Mesopredator Release within an Oceanic Island System". Proceedings of the National Academy of Sciences of the United States of America. 104 (52): 20862–20865. Bibcode:2007PNAS..10420862R. doi:10.1073/pnas.0707414105. PMC 2409232. PMID 18083843.
You’ll get five (5) copies of the Deluxe Edition of Magical Kitties Save the Day, the benefits of the Make Your Kitty Magical backer level, and Atlas RPG Producer Justin Alexander will run a session of Magical Kitties Save the Day for you and up to four of your friends. If arrangements can be made to do this in person (in Minneapolis/St. Paul, Duluth, or at a convention we’re attending), we will do so. If not, the game will be run via video chat. (Scheduling subject to Atlas Games’ approval.)

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]

If you’re a roleplayer with years of experience, Magical Kitties makes it easy to introduce your friends and family your favorite hobby. But if you’ve never played a roleplaying game before, Magical Kitties Save the Day makes it easy to try something new! Between The Big Adventure, “The Game Master’s First Adventure,” and the Kitty Tips! you’ll find throughout every book, it’ll be like we’re right there by your side the whole time.

Part of the kitten's immune system is the mucosal immune system, which is within the gastrointestinal tract. The mucosal immune system is largely responsible for coordinating proper immune responses by tolerating innocuous antigens and attacking foreign pathogens.[27] In order to optimize kitten health and increase chances of survival, it is important to optimize the link between the gut-associated lymphoid tissue and the microbiota of the gastrointestinal tract. Lasting health and longevity can be accomplished partly through proper nutrition[28] and establishing a healthy gut from birth through utilizing colostrum.[29]

An alternative word is English puss (extended as pussy and pussycat). Attested only from the 16th century, it may have been introduced from Dutch poes or from Low German puuskatte, related to Swedish kattepus, or Norwegian pus, pusekatt. Similar forms exist in Lithuanian puižė and Irish puisín or puiscín. The etymology of this word is unknown, but it may have simply arisen from a sound used to attract a cat.[28][29]