Click Consonants: A Rare Phenomenon in Human Language
Among all the sounds human beings can make, clicks are perhaps the most striking to uninitiated ears. Produced by trapping air between two points of tongue contact and releasing it inward, they generate a sharp burst of sound quite unlike anything in most of the world's languages. Yet for speakers of the Khoisan languages of southern Africa—and for a small number of Bantu languages that borrowed them—clicks are as ordinary as the letter p.
The Mechanics of Click Production
A click is a velaric ingressive consonant. The back of the tongue makes contact with the velum (soft palate), sealing off a pocket of air. A second, forward point of contact—at the teeth, the alveolar ridge, the palate, or the roof of the mouth—creates a front closure. When the front closure is released, the negative pressure snaps the tongue forward with an audible pop. The result is one of four or more distinct click types, depending on where the front contact is made.
IPA symbols for click types use characters like ʘ (bilabial click), ǀ (dental click), ǃ (alveolar click), ǂ (palatal click), and ǁ (lateral click). Overlay these with voicing, aspiration, nasalisation, or tone, and a single language like !Xóõ can use more than 80 distinct click phonemes. Explore click languages in our feature database for a full breakdown.
Distribution and Origins
Clicks are native to the Khoisan phylum—a loosely related group of hunter-gatherer languages centred in Botswana, Namibia, and South Africa. They were subsequently borrowed into neighbouring Bantu languages such as Zulu and Xhosa, probably through centuries of intermarriage and trade. This borrowing is remarkable: clicks are among the rarest cases of complex phonological systems crossing genetic family lines.
Genetic studies suggest that populations speaking Khoisan languages carry some of the oldest Y-chromosome lineages on earth, consistent with archaeological and linguistic evidence that click-using cultures represent ancient, deep-rooted communities. Their languages may preserve phonological features from very early stages of human speech. See our African languages overview for more context on the continent's extraordinary linguistic diversity.