Until approximately one year of age, the kitten is undergoing a growth phase where energy requirements are up to 2.5 times higher than maintenance.[33] Pet nutritionists often suggest that a commercial cat food designed specifically for kittens should be offered beginning at 4 weeks of age.[28] Fat has a higher caloric value than carbohydrates and protein, supplying 8.5kcal/g.[34] The growing kitten requires arachidonic and linoleic acid which can be provided in omega-3 fatty acids.[23] Docosahexaenoic acid (DHA) is another vital nutrient that can be supplied through omega 3 fatty acid. Addition of DHA to the diet benefits the cognition, brain and visual development of kittens.[28]
Encouraged by the reception to the first West End revival, producers began looking to bring Cats back to Broadway in early 2015.[108] The Broadway revival opened on 31 July 2016 at the Neil Simon Theatre.[109] It featured new choreography by Andy Blankenbuehler, with Nunn and Napier from the original creative team returning to direct and design respectively.[110] Scherzinger, who played Grizabella in the 2014 West End revival, had originally agreed to reprise the role on Broadway but later withdrew.[111] Leona Lewis was cast as Grizabella instead and was ultimately succeeded by Mamie Parris in October 2016.[64] The Broadway revival closed on 30 December 2017 after 16 previews and 593 performances.[109]

Many of the ensemble characters were created by the original cast through extensive improvisation sessions held during the rehearsal process. Said Nunn: "[O]n day one of rehearsals what we had was 15 poems set to music and five weeks later we had a show with characters, relationships and stories running from beginning to end."[24][25] The production faced a last minute mishap when Dench snapped her Achilles tendon during rehearsals for "The Old Gumbie Cat" and had to pull out one week before the first preview. Her understudy Myra Sands replaced her as Jennyanydots, while Elaine Paige agreed to take over the role of Grizabella. Opening night was pushed back to 11 May, but Mackintosh refused to postpone the previews as he wanted to dispel the industry rumours that the production was an impending debacle.[26]
The first contender Munkustrap introduces is Jennyanydots ("The Old Gumbie Cat"), a large tabby cat who lazes around all day, but come nighttime, she becomes active, teaching mice and cockroaches various activities to curb their naturally destructive habits. Just as Jennyanydots finishes her song, the music changes suddenly and Rum Tum Tugger makes his extravagant entrance in front of the tribe ("The Rum Tum Tugger"). He is very fickle and unappeasable, "for he will do as he do do, and there's no doing anything about it".
Free-fed feral cats and house cats tend to consume many small meals in a single day, although the frequency and size of meals varies between individuals.[133] Cats use two hunting strategies, either stalking prey actively, or waiting in ambush until an animal comes close enough to be captured.[160] Although it is not certain, the strategy used may depend on the prey species in the area, with cats waiting in ambush outside burrows, but tending to actively stalk birds.[161]:153
Most of the lyrics in Cats were taken from Old Possum's Book of Practical Cats with very minor alterations. Supplementary verses from unpublished poems by Eliot were adapted for "Grizabella: The Glamour Cat" and "Journey to the Heaviside Layer", while the song "The Moments of Happiness" was taken from a passage in Eliot's The Dry Salvages. Cats director Trevor Nunn and lyricist Richard Stilgoe provided the remaining lyrics, namely for the opening number "Jellicle Songs for Jellicle Cats" and the most famous song from the musical "Memory". The former was written by Nunn and Stilgoe and was modelled after an unpublished poem by Eliot titled "Pollicle Dogs and Jellicle Cats", while the latter was written by Nunn based on another Eliot poem titled "Rhapsody on a Windy Night".[1]
One of Nunn's stipulations for agreeing to direct Practical Cats was that actress Judi Dench would be cast in the musical. Lloyd Webber was happy to oblige given her credentials and so Dench joined the company in the dual roles of Grizabella and Jennyanydots. Former Royal Ballet principal dancer Wayne Sleep was offered the part of Mr. Mistoffelees after Lloyd Webber and Mackintosh attended a performance by his dance troupe, one of the many dance showcases they saw in preparation for the musical. Casting for the other roles began in November 1980, with auditions held across the UK for dancers who could also sing and act. There was an initial disagreement over the casting of Nicholas as Rum Tum Tugger; Nunn had misgivings about the actor's laid-back attitude but eventually yielded to Lloyd Webber, Mackintosh and Lynne, all of whom were keen on Nicholas for the role. Sarah Brightman, who had already made a name for herself with the chart hit "I Lost My Heart to a Starship Trooper", arranged a private audition and was cast in an as-then undecided role. By December, the full cast had been assembled.[18]
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]
Some of the same factors that have promoted adaptive radiation of island avifauna over evolutionary time appear to promote vulnerability to non-native species in modern time. The susceptibility of many island birds is undoubtedly due to evolution in the absence of mainland predators, competitors, diseases, and parasites, in addition to lower reproductive rates and extended incubation periods.[231] The loss of flight, or reduced flying ability is also characteristic of many island endemics.[232] These biological aspects have increased vulnerability to extinction in the presence of introduced species, such as the domestic cat.[233] Equally, behavioral traits exhibited by island species, such as "predatory naivety"[234] and ground-nesting,[231] have also contributed to their susceptibility.
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]
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