 The functions of reserve were in preservation of typical ecosystems and unique observation of the natural dynamics of ecosystems and their components (biota, soil, water, climate), the study of the influence of anthropogenic factors on the change in the natural state of the natural environment at the territory of the biosphere reserve and training researchers in conservation and environmental monitoring.On the territory of the Prioksko-Terrasny state nature biosphere reserve, covering 4945 ha, 134 species of birds from 14 orders (Ciconiiformes, Anseriformes, Falconiformes, Galliformes, Gruiformes, Charadriiformes, Columbiformes, Cuculiformes, Strigiformes, Caprimulgiformes, Apodiformes, Coraciiformes, Piciformes, Passeriformes) had been registered by 1991.Later 5 more species were observed here.