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
Northern Berber languages fall into three groups: The eastern boundaries of the North Berber varieties are uncertain. Some linguists include the Nafusi and Ghadames languages, while others do not. Most regard Ghadamès as lying outside of Northern Berber, but the "Ethnologue" does not. There is no authoritative answer as to whether the Northern Berber varieties constitute a language rather than a dialect. Some academics believe that not only Northern Berber but all the Berber languages are dialects of a single language, whereas others come up with much higher counts. At any rate, mutual comprehensibility among the Northern Berber varieties is high, though not