The FAUNA OF CONGO is the main theme of this scientific research. It is a series of publications by the author, of characteristic animals of the Democratic Republic of Congo, a country scandalously rich in biodiversity but little known. The first part of this book is related to the qualitative and quantitative study of the endogenous Microarthropods of the Nsadi Valley. The second part is both present and critical of the Mammals, tenants of the Zoological Garden of Kinshasa. The global objective of this research is to attract the curiosity of scientists and men of good will, interested in the Ecology and the conservation of Animal Resources, in the world and more particularly in the Democratic Republic of Congo. The study of endogenous microarthropods as well as mammals of the zoological garden of Kinshasa is an approach that has been made possible by the means at hand. With a little more means, it will soon be possible to conduct more in-depth research for a better contribution to national and global biodiversity.