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You can not preserve what you do not know. This was one of the first premises I learned during my university days. It is a suggestion that comes with another important element: the publication of data. If we do not publish, we do not know, and if we do not know, we do not preserve.In order to maintain continuity in the knowledge of the conservation status of the country's mammals, the third edition of the Red List of Ecuador's mammals was published this December, a document recognized by the National Environmental Authority, which gives it official status and automatically replaces the previous edition. This process is carried out every ten years (2001, 2011 and 2021).Thanks to the contribution of more than one hundred specialists and professionals of the country's mastozoology, the current Red List presents the evaluation of 547 mammal taxa; of these, 452 were native species, four vagrant, 17 introduced and 11 Antarctic; in addition, we included 46 subspecies, 23 populations.The distribution by categories of the current assessment indicates that 137 species are threatened with extinction in the country (within the categories of Critically Endangered, Endangered and Vulnerable), this is 30% of the wealth of mammals currently recognized in the country and an increase of 36% compared to the 2011 assessment.As it is an objective of the journal Mammalia aequatorialis to publish information that contributes to the knowledge of Ecuadorian mammals, in this, our third issue, we include several articles that provide information on the conservation of several species. A particular fact, is the article concerning the primates of the province of Azuay, which not only confirms the presence of two species for this part of the country (Alouatta palliata aequatorialis and Cebus aequatorialis), but also includes a geographical analysis that determines the amount of suitable habitat available at present and projected for 2050 in two scenarios of climate change; this article also proposes several polygons that can be considered as priority areas for the conservation of both primates and suggests measures for in situ conservation of their populations.This issue also disseminates information for the management of wild mammals in the country. One of them includes a summary of the recommendations of the Bioethics Committee of the Ecuadorian Association of Mammalogy for the management of mammals in research; and another presents specific data on the visits of the southern elephant seal (Mirounga leonina) to the coasts of continental Ecuador and the Galapagos Islands. Both papers suggest protocols that seek to optimize the management of wild mastofauna, with special attention to species that may be threatened.This issue of Mammalia aequatorialis also contributes to the knowledge of the richness of flightless micromammals of the Cerro Blanco Protected Forest, reviews the state of the art of trypanosome studies in mammals in Ecuador and gathers reproductive data on several species of phyllostomid bats.The issue closes with several short contributions related to new contributions on the distribution of a Coendou species, the first report of an albino Dasyprocta, several cases of melanism in a Leopardus species and another of leucism in the Andean tapir (Tapirus pinchaque).All these contributions, which appear in the third issue of Mammalia aequatorialis, have something in common: they contribute to the knowledge of the mammals of Ecuador. A knowledge that favors conservation. And a conservation that is becoming more and more necessary in the country.