The Barbary Thuya (Tetraclinis articulata) is linked geographically to the three countries of the Maghreb: Morocco, Algeria, and Tunisia. In Morocco, the current surface area is the order of 607,900 ha. and is in constant regression. It is often cut, considering its capacity to grow from stumps, an uncommon capacity of conifers, and is generally found in the form of preforestral groups where it is rarely alone. Among its competitors, there are: Juniperus phoenicea, Pinus halepensis, Ceratonia siliqua, Argania spinosa, Quercus rotundifolia, Pistacia lentiscus, Pistacia atlantica, Phillyrea latifolia. The floristic panorama of the undergrowth is also very rich: cists, lavender, broom, rosemary, alfa, dowm, etc... The number of Arthropods species counted in Tetraclinus is about 160, while the nesting bird stocks are among the least varied and abundant of forestral ecosystems of the northern part of the country.