The Berber thuja (Tetraclinis articulata) is linked geographically to the three Maghreb countries: Morocco, Algeria and Tunisia. In Morocco, the current surface area is of the order of 607,900 ha and is in constant decline. It is very often in coppice due to its ability to reject stumps, an uncommon capacity among softwoods, and generally occurs in the form of preforest stands where it is rarely present alone. Its competitors include: Juniperus phoenicea, Pinus halepensis, Ceratonia siliqua, Argania spinosa, Quercus rotundifolia, Pistacia lentiscus, Pistacia lentiscus, Pistacia atlantica, Phillyrea latifolia. The floral procession of the undergrowth is also very rich: cistus, lavender, broom, rosemary, alfa, doum, etc... The species of Arthropods recorded in the tetraclinas are around 160; while the nesting avian populations are among the least varied and the least abundant of forest ecosystems in the north of the country.