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]

The cat skull is unusual among mammals in having very large eye sockets and a powerful specialized jaw.[66]:35 Within the jaw, cats have teeth adapted for killing prey and tearing meat. When it overpowers its prey, a cat delivers a lethal neck bite with its two long canine teeth, inserting them between two of the prey's vertebrae and severing its spinal cord, causing irreversible paralysis and death.[67] Compared to other felines, domestic cats have narrowly spaced canine teeth relative to the size of their jaw, which is an adaptation to their preferred prey of small rodents, which have small vertebrae.[67] The premolar and first molar together compose the carnassial pair on each side of the mouth, which efficiently shears meat into small pieces, like a pair of scissors. These are vital in feeding, since cats' small molars cannot chew food effectively, and cats are largely incapable of mastication.[66]:37 Although cats tend to have better teeth than most humans, with decay generally less likely because of a thicker protective layer of enamel, a less damaging saliva, less retention of food particles between teeth, and a diet mostly devoid of sugar, they are nonetheless subject to occasional tooth loss and infection.[68]
Cats introduced a marketing strategy that set the template for subsequent megamusicals. Early advertisements for the musical did not feature traditional pull quotes (despite many positive reviews) or any of the cast, focusing instead on branding the show itself as the star. It did this by adopting — and then aggressively promoting — a single recognisable image (the cat's-eyes logo) as the face of the show.[321] The cat's-eyes logo was the first globally marketed logo in musical theatre history,[88] and was paired with a tagline ("now and forever") to create what The Daily Telegraph called "one of musical theatre's greatest posters".[322] Such branding emblems proved equally effective for later megamusicals, as seen with the waif Cosette for Les Misérables and the Phantom's mask for The Phantom of the Opera. This advertising method had the additional effect of diminishing the importance of critical reviews, popularising the so-called "critic-proof" status of megamusicals.[321]
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]
^ 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 10.1.1.452.7854. doi:10.1017/S1464793105006718. PMID 16094805. Archived (PDF) from the original on 22 September 2017.
The musical has also been translated and staged nationally in Asia. From September 2008 to January 2009, a Korean-language production performed at the Charlotte Theatre in Seoul, with Shin Youngsook and Ock Joo-hyun alternating as Grizabella, Kim Jin-woo and Daesung alternating as Rum Tum Tugger, and Kim Bo-kyung as Rumpleteazer.[268] This production was revived and toured South Korea from 2011 to 2012, with Insooni and Park Hae-mi taking turns to portray Grizabella.[269] The first Mandarin-language production toured various cities in China in 2012.[270]
The fourth national company, Cats National IV, toured the United States for 13 years from March 1987 to December 1999.[117] It overtook the first national tour of Oklahoma! in November 1997 to become the longest-running tour in theatre history, and played its 5,000th performance in July 1999.[118] Notable performers in the fourth tour included Amelia Marshall as Sillabub (1988), Jan Horvath as Grizabella (1990), Bryan Batt as Munkustrap (1991–1992), Jennifer Cody as Rumpleteazer (1992), David Hibbard as Rum Tum Tugger (1992–1993), Natalie Toro as Grizabella (1992, 1997), Christopher Gattelli as Mistoffelees (1993), John Treacy Egan as Old Deuteronomy (1993–1994), J. Robert Spencer as Rum Tum Tugger (1995), Bart Shatto as Bustopher Jones/Gus/Growltiger (1996), Linda Balgord as Grizabella (1998), Andy Karl as Rum Tum Tugger (1998), and Lena Hall as Demeter (1998).[117] By June 1997, the North American touring companies had grossed over $400 million.[88]
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]
^ Jump up to: a b Driscoll, C. A.; Menotti-Raymond, M.; Roca, A. L.; Hupe, K.; Johnson, W. E.; Geffen, E.; Harley, E. H.; Delibes, M.; Pontier, D.; Kitchener, A. C.; Yamaguchi, N.; O'Brien, S. J.; Macdonald, D. W. (2007). "The Near Eastern Origin of Cat Domestication". Science. 317 (5837): 519–523. Bibcode:2007Sci...317..519D. doi:10.1126/science.1139518. ISSN 0036-8075. PMC 5612713. PMID 17600185.
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Cats can synthesize niacin, but their breakdown exceeds the rate that it can be synthesized and thus, have a higher need for it, which can be fulfilled through an animal-based diet.[24] Pyridoxine (vitamin B6) is required in increased amounts seeing as it is needed to produce amino acids.[24] To continue, vitamin B12 is an AAFCO-recommended vitamin essential in the metabolism of carbohydrates and protein and maintains a healthy nervous system, healthy mucous membranes, healthy muscle and heart function and in general, promotes normal growth and development.[42] Choline is also a AAFCO recommended ingredient for kittens, which is important for neurotransmission in the brain and as a component of membrane phospholipids.[24] Biotin is another AAFCO-recommended vitamin to support thyroid and adrenal glands and the reproductive and nervous systems.[24] Kittens also require riboflavin (vitamin B2) for heart health, pantothenic acid (vitamin B5), and folacin.[42]
Cats has been referenced and satirised many times on screen; from the films Six Degrees of Separation[293] and Team America: World Police,[341] to the sketch comedy Saturday Night Live, and animated series like Family Guy, The Simpsons and BoJack Horseman,[342] as well as live action comedies including The Golden Girls, Caroline in the City, Glee and Unbreakable Kimmy Schmidt.[343][344] An episode of the musical television series Crazy Ex-Girlfriend, titled "I Need Some Balance", parodied Cats by having all the songs sung by anthropomorphic cats who "introduce [themselves] over '80s Broadway beats".[345]
To date, little scientific data is available to assess the impact of cat predation on prey populations outside of agricultural situations. Even well-fed domestic cats may hunt and kill, mainly catching small mammals, but also birds, amphibians, reptiles, fish, and invertebrates.[155][210] Hunting by domestic cats may be contributing to the decline in the numbers of birds in urban areas, although the importance of this effect remains controversial.[211] In the wild, the introduction of feral cats during human settlement can threaten native species with extinction.[205] In many cases, controlling or eliminating the populations of non-native cats can produce a rapid recovery in native animals.[212] However, the ecological role of introduced cats can be more complicated. For example, cats can control the numbers of rats, which also prey on birds' eggs and young, so a cat population can protect an endangered bird species by suppressing mesopredators.[213]
In 2003, the International Commission on Zoological Nomenclature (ICZN) fixed the scientific name for the wildcat as F. silvestris. The same commission ruled that the domestic cat is a distinct taxon Felis catus.[40][41] Following results of phylogenetic research, the domestic cat was considered a wildcat subspecies F. silvestris catus in 2007.[42][43]
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