Click languages

Click languages:

see African languagesAfrican languages,
geographic rather than linguistic classification of languages spoken on the African continent. Historically the term refers to the languages of sub-Saharan Africa, which do not belong to a single family, but are divided among several distinct linguistic stocks.
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Genetic comparison of two such tribes suggests that the unusual click languages, known as Khoisan languages, could resemble the ancestral tongue of all humankind.
For more than a century, linguists have debated the origins of these click languages, notes Alec Knight of Stanford University.
Knight says this, in turn, implies that click languages date back that far, as well.