Associação Cabeço Santo (ACS) is an NGO for environmental knowledge and practice. We deal with the preservation and ecological restoration of the native forest landscapes, for the sake of the health of the soil, water, and for the resilience of the ecosystems. We are on a process of combatting the non-native growth and safeguarding the animal and vegetal niches for biodiversity and for the remanence of the native biomes. Our regular activities lie in the removal of invasive species, sowing and planting of native species, and signalling pedestrian trails for the discovery of native habitats. Our creation in December 2019 gave continuity to and expanded the Project Cabeço Santo that started in 2006.