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Added in lead: Cats' status as one of the world's most invasive species
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Female domestic cats can have [[kitten]]s from [[Spring (season)|spring]] to late [[autumn]] in [[temperate zones]] and throughout the year in [[equatorial region]]s, with [[Litter (zoology)|litter]] sizes often ranging from two to five kittens. Domestic cats are bred and shown at events as registered [[pedigreed cat]]s, a hobby known as [[cat fancy]]. [[Animal population control]] of cats may be achieved by [[spaying]] and [[neutering]], but their proliferation and the abandonment of pets has resulted in large numbers of feral cats worldwide, contributing to the extinction of [[bird]], [[mammal]], and [[reptile]] species.
 
{{As of|2017|post=,}} the domestic cat was the second most popular pet in the [[United States]], with 95.6&nbsp;million cats owned and around 42 million households owning at least one cat. In the [[United Kingdom]], 26% of adults have a cat, with an estimated population of 10.9&nbsp;million pet cats {{As of|2020|lc=y|post=.}} {{As of|2021|post=,}} there were an estimated 220 million owned and 480&nbsp;million stray cats in the world. The domestic cat is listed by the [[World Conservation Union]] as one of the [[List of globally invasive species|world's worst invasive species]].<ref>{{cite web |date=1 December 2000 |title=100 of the World's Worst Invasive Alien Species: A Selection from the Global Invasive Species Database |url=http://www.issg.org/pdf/publications/worst_100/english_100_worst.pdf |url-status=dead |archive-url=https://web.archive.org/web/20181222193550/http://issg.org/pdf/publications/worst_100/english_100_worst.pdf |archive-date=22 December 2018 |access-date=4 January 2017 |publisher=The Invasive Species Specialist Group, a Specialist Group of the Species Survival Commission of the World Conservation Union |page=6 |vauthors=Lowe S, Browne M, Boudjelas S, De Poorter M}}</ref>
 
==Etymology and naming==