ENThe search for relict coasts from the Early-Middle Holocene, and their determination according to the remains of vegetation (pine and oak forests), as well as according to peat deposits in the lagoons of the Early Holocene coastal areas that existed in the Lithuanian coastal area, has been ongoing in Lithuanian territorial waters for 20 years. In this article, the plentiful osteological and osteo-archaeological material is analysed, some of which is from currently flooded areas, and from now-discovered settlements in the Baltic coastal area. This article is devoted to the study of the change in fauna in MIS-3, the Final Pleistocene to the Early and Middle Holocene, establishing its chronology and the composition of species. With the use of energy-dispersive X-ray spectroscopy (EDS) and a histological section, the change in fauna is recorded while both the coastline and the natural environment are altered. People’s activities from these times are analysed based on data from osteological material. Keywords: Faunal remains, Osteoarchaeology, Baltic Sea coast, Pleistocene-Holocene, Subsistence economy, Lithuania. [From the publication]