The reserve serves as a corridor for the entry of species of subtropical origin to the Uruguayan territory. Inside of the reserve there are many rare species of
reptiles and
amphibians. The area consists of unique features of the landscape with different species of plants and animals. Within the reserve are creeks with a structure of jungle-like subtropical forest. In addition there are wide grasslands and large forests. The biome
pampa is characterized by many of species of grasses, and contributes to thenesting of many species of birds.
Flora The predominant vegetation in the area corresponds to the grassland in winter and scrub shrub. Trees and shrubs predominate on the slopes, being able to vary the composition of species in the different positions of the same. In addition, there is a pronounced forestry.
Animal biodiversity There can be found a diversity of different species in the biosfere reserve. The list of priority species is based on the list identified for the Protected Landscape Valle del Lunarejo, in which are properly represented all the species of the reserve. The most important records from the list are: 22 species of amphibians (nearly 50% registered at a national level), 41 species of reptiles (62% registered at a national level), 173 species of birds (40% recorded at national level) and 31 species of mammals (27% registered at the national level). A large part of the species registered in Uruguay can also be found in the reserve. Apart from this a part of the species in the reserve are recorded as a priority species for conservation. For example, the
coati, the
giant armadillo cerreta and the rattlesnake of South America. In addition to the wild animals, there are many sheep, cattle horses and other farm animals. == The main functions ==