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
Berber languages while the Kabyles called theirs "Taqbaylit", and the inhabitants of the Siwa Oasis called their language "Siwi". In Tunisia, the local Amazigh language is usually referred to as "Shelha", a term which has been observed in Morocco as well. One group, the Linguasphere Observatory, has attempted to introduce the neologism "Tamazic languages" to refer to the Berber languages. Berber is a branch of the Afroasiatic language family. Since modern Berber languages are relatively homogeneous, the date of the Proto-Berber language from which the modern group is derived was probably comparatively recent, comparable to the age of the Germanic or Romance