Berber calendar December - 13 January), and 20 "black nights" (Berber: "iḍan tiberkanin/isṭṭafen", Arabic "al-lyali al-sud"), beginning on the first day of "yennayer", corresponding to the Gregorian 14 January. The first day of the year is celebrated in various ways in the different parts of North Africa. A widespread tradition is a meal with particular foods, which vary from region to region (such as a couscous with seven vegetables). In some regions, it is marked by the sacrifice of an animal (usually a chicken). In Algeria, such a holiday is celebrated even by many people who don't use the Berber calendar in
Proto-Berber language has produced a comprehensive reconstruction of Proto-Berber morphology based on Tuareg. Additional work on the reconstruction of Proto-Berber morphology was done by Maarten Kossmann. Proto-Berber had no grammatical case. Its descendants developed a marked nominative that is still present in Northern Berber and Southern Berber/Tuareg. In some cases, Proto-Berber lost it thereafter, recently in Eastern Berber and Western Berber (Zenaga). The relics of the ancient morphological segments preserved in the modern varieties, in the Libyan inscriptions and in the ancient toponymical stratas show that the basis of word formation is a monosyllabic lexical unit (vc, cvc) whose vowels and consonants