Companhia das Lezírias has its forest management certified by an international standard since 27/9/2010 (SA - FM / COC - 002659 certificate).

This certification highlights to the Companhia and its customers and employees, the sustainability of its forest management. This public recognition is of particular importance, as the Companhia das Lezírias has in its custody a territory with resources of high importance.

It is this forest that supports the habitats and many species, particularly birds, that justify that an important part of the “Companhia” (of which 5,000 ha are forest) is included in the Special Protection Zone and on the site that will be part of the Natura 2000 network.

Of the approximately 150 bird species and 24 mammal species that have been observed in CL's forest area, they have conservation status (endangered, vulnerable, insufficiently known or critically endangered):

• European Honey Buzzard (Pernis apivorus);
• Northern Goshawk (Accipiter gentilis);
• Bonelli's Eagle (Hieraaetus fasciatus);
• Eurasian Hobby (Falco subbuteo);
• European Nightjar (Caprimulgus europeus);
• Red-necked Nightjar (Caprimulgus ruficollis);
• European Polecat (Custela putorius);
• European Wildcat (Felis silvestris);
• Cabrera's Vole (Microtus cabrerae).

Eleven more species from other classes of animals have been identified. Of these, the following have conservation status:

• European Eel (Anguilla anguilla);
• Boga–portuguesa (Chondrostoma lusitanicum);
• Common Parsley Frog (Pelodytes punctatus).

There are also several habitats, four of which have priority status:

• 91E0 – Alnus glutinosa and Fraxinus excelsior Alluvial Forests;
• 2150 – Atlantic Decalcified Fixed Dunes;
• 3170 – Mediterranean Temporary Puddles;
• 4020 – Temperate Atlantic Wetlands of Erica ciliaris and Erica tetralix.

Recent flora surveys have already identified 335 species of vascular plants in a total of 59 families. Of these, there is the presence of a species with conservation status, Thymus capitellatus and the presence of a rare species, Elatine brochonii.

Below, several documents related to the certification process are made available to the public, allowing to make known several relevant aspects of forest and cinegetic management carried out.