Cats are thought to be primarily responsible for the extinction of 33 species of birds, and the presence of feral and free-ranging cats makes some otherwise suitable locations unsuitable for attempted species reintroduction. In comparison to dogs, cats have not undergone major changes during the domestication process, as the form and behavior of the domestic cat is not radically different from those of wildcats and domestic cats are perfectly capable of surviving in the wild.A 2016 study found that leopard cats were undergoing domestication independently in China around 5,500 BC, though this line of partially domesticated cats leaves no trace in the domesticated populations of today. Cats have either a mutualistic or commensal relationship with humans.
The alternative idea is that cats were simply tolerated by people and gradually diverged from their wild relatives through natural selection, as they adapted to hunting the vermin found around humans in towns and villages.
Many references refer to "Berber" (Kabyle) kaddîska "wildcat" and "Nubian kadīs" as possible sources or cognates, but M.
Lionel Bender says the Nubian term is a loan from Arabic قِطَّة qiṭṭa.
and include lions, tigers, cougars and many others. Two main theories are given about how cats were domesticated.
Within this family, domestic cats (Felis catus) are part of the genus Felis, which is a group of small cats containing about seven species (depending upon classification scheme). In one, people deliberately tamed cats in a process of artificial selection as they were useful predators of vermin.