The domestic cat's ability to thrive in almost any terrestrial habitat has led to its designation as one of the world's most invasive species. As it is little altered from the wildcat, it can readily interbreed with the wildcat. This hybridization poses a danger to the genetic distinctiveness of some wildcat populations, particularly in Scotland and Hungary and possibly also the Iberian Peninsula.
The musical returned to the West End in 2014 for a planned 12-week limited run at the London Palladium. Beginning on 6 December, the revival starred Nicole Scherzinger as Grizabella, and featured the original creative team, with direction from Nunn, choreography by Lynne and design by Napier. Lloyd Webber was also involved and rewrote "The Rum Tum Tugger" and "Growltiger's Last Stand" for the revival. The run was later extended through April 2015 and an additional 100,000 tickets were released, with Kerry Ellis replacing Scherzinger as Grizabella. The musical returned once again to the London Palladium for another limited run lasting from 23 October 2015 to 2 January 2016, starring Beverley Knight as Grizabella.
Felines are natural carnivores and do not intentionally consume large quantities of carbohydrates. The domestic cat's liver has adapted to the lack of carbohydrates in the diet by using amino acids to produce glucose to fuel the brain and other tissues. Studies have shown that carbohydrate digestion in young kittens is much less effective than that of a mature feline with a developed gastrointestinal tract. Highly digestible carbohydrates can be found in commercial kitten food as a source of additional energy as well as a source of fiber to stimulate the immature gut tissue. Soluble fibre such as beet pulp is a common ingredient used as a fibrous stool hardener and has been proven to strengthen intestinal muscles and to thicken the gut mucosal layer to prevent diarrhea.
A combination of required nutrients is used to satisfy the overall growth and development of the kitten body, there are many ingredients that kittens do not require, but are included in diet formulation to encourage healthy growth and development. These ingredients include: dried egg as source of high quality protein and fatty acids, flaxseed as source of flaxseed oil which is rich in omega 3 fatty acid and aids in digestion, calcium carbonate as a source of calcium, and calcium pantothenate (vitamin B5) acts as a coenzyme in the conversion of amino acids and is important for healthy skin.
Lloyd Webber began composing the songs in late 1977 as a songwriting exercise, partly because Eliot's book had been a childhood favourite and partly to see if he could write music to predetermined lyrics. The compositions were performed privately for friends but Lloyd Webber had no further intentions for them at the time. After his song cycle Tell Me on a Sunday was televised by the BBC in early 1980, Lloyd Webber began to consider using his musicalizations of Eliot's poems in the same vein for a televised concert anthology. He approached producer Cameron Mackintosh to discuss possible avenues for the songs.
Cats has received many international awards and nominations. The original London production was nominated for six Laurence Olivier Awards in 1981, winning two awards including Best New Musical. Two years later, the original Broadway production won seven Tony Awards, including Best Musical, out of eleven nominations. The London and Broadway cast recordings were nominated for the Grammy Award for Best Musical Theater Album, which the latter won. In 2015, the London revival was nominated for — but did not win — two Olivier Awards, including Best Musical Revival.
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, which they use to communicate through urine spraying and marking with scent glands. 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. About 70–80% of cats are affected by nepetalactone. 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.
Cats is considered the quintessential megamusical, because it reconceived, like no other show before, theatrical space as an immense affective encompasser, that transforms the viewing experience into a hypercharged thrill-ride and the spectator into an explorer of new and challenging aural and visual sensations. Its unprecedented success paved the way for even bolder hyperspatial configurations, made the set designer a proper environment builder and raised light and sound design into the status of art in their own right. It also paved the way for the constant revolutionization of stage technology.
Additionally, Cats was the first Broadway and West End show to capitalise on merchandising as a major revenue stream. Stalls were set up in the theatre lobbies to sell souvenirs ranging from toys and watches to coffee mugs, all of which were emblazoned with the cat's-eyes logo. The official Cats t-shirt became the second-best-selling t-shirt in the world in the 1980s, second only to the Hard Rock Cafe t-shirt. Merchandising has since become an important source of income for the industry.
The domestic cat is a member of the Felidae, a family that had a common ancestor about 10–15 million years ago. The genus Felis diverged from the Felidae around 6–7 million years ago. Members of this genus include the jungle cat (F. chaus), European wildcat (F. silvestris), African wildcat (F. lybica), Chinese mountain cat (F. bieti), sand cat (F. margarita) and black-footed cat (F. nigripes). Results of phylogenetic research confirm that these wild Felis species evolved through sympatric or parapatric speciation, whereas the domestic cat evolved through artificial selection.