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 A.D. Blench (2018) notes that Berber is considerably different from other Afroasiatic branches, but modern-day Berber languages displays low internal diversity. The presence of Punic borrowings in Proto-Berber points to the diversification of modern Berber language varieties subsequent to the fall of Carthage in 146 B.C.; only Zenaga lacks Punic loanwords. Additionally, Latin loanwords in Proto-Berber point to the breakup of Proto-Berber between 0-200 A.D. During this time period, Roman innovations including the ox-plough, camel, and orchard management were adopted by Berber communities along the "limes", or borders of the Roman Empire. This resulted in a new trading culture involving