This article describes the phonology of the Somali language. Consonants Common Somali has 23 consonant phonemes. Its consonants cover every place of articulation on the IPA chart, though not all of these distinctions are phonemic. /b/ is often realized as [β] when in a stressed intervocalic position. The voiced affricate is missing in many northern and eastern dialects, with the voiceless affricate taking its place. is a voiced retroflex stop. Some phoneticians say that it has an implosive quality for some speakers. It is sometimes realised as a flap between vowels. The voiceless stops and are always aspirated. , the voiced pharyngeal fricative, may have creaky voice. is often pronounced with breathy voice and may be partially devoiced. Between vowels it may be a single tap. can, in some dialects, be pronounced as a . /q/ is sometimes epiglottalized. Vowels Somali has five vowel articulations that all contrast murmured and harsh voice as well as vowel length. There is little change in vowel quality when the vowel is lengthened. Each vowel has a harmonic counterpart, and every vowel within a harmonic group (which notably can be larger than a word in Somali) must harmonize with the other vowels. The Somali orthography, however, does not distinguish between the two harmonic variants of each vowel. There are five diphthongs that also occur in front and back, long and short versions, except for , which does not appear to occur in the back series. Tone Lexical prominence in Somali can be classified under a pitch accent system, in which there is one high-tone mora per word. The tone system distinguishes both grammatical and lexical differences. Differences include numbers singular and plural (a grammatical distinction), and masculine and feminine genders (a grammatical and sometimes also lexical distinction). One example is inán ('girl') versus ínan ('boy'). This reflects a tonal pattern that codes grammatical gender, such as dameér ('female donkey') versus daméer ('male donkey'). The question of the tone system in Somali has been debated for decades. The modern consensus is as follows. In Somali, the tone-bearing unit is the mora rather than the vowel of the syllable. A long vowel or a diphthong consists of two morae and can bear two tones. Each mora is defined as being of high or low tone. Only one high tone occurs per word and this must be on the final or penultimate mora. Particles do not have