The fauna of non-passerine species of birds of Moldova since the middle of the XX - th century, became noticeably degrade due to the apparent deterioration of bird habitats. This led to a reduction of majority of species populations. Many of them entered in the risk zone and category of rare and endangered. Disappeared 21 species (12.35% of the former fauna), most of them irretrievably or retaining a ghostly chance of getting a new status. Instable state of the environmental conditions of this period and tendency to deterioration identified advantages and disadvantages of the structural and faunal assemblage in the current situation. Bird species have been tested for conditions of fitness and resistance on a range of environmental and adaptive traits, as well as principles of selection mechanism, according to a concept of life strategies. The composition of this group consists of four types of landscape-biotopical complexes and seven types of fauna, where prevail wetland species, as representatives of the most biologically productive and common areas in the country. As well as species of the European (Eu) (30.2%) and Transpalearctic (Tp) (20.81%) types of fauna as native by geographical origin. Also there are species of the Mongolian (Mn) fauna (14.77%), which had a great influence on its formation through the close spatial contacts with the territory and environmental compliance with its terms. Included in the overall composition, they populated evenly environmental field on various topical and environmental positions, taking on more vacancies of upper trophic levels and a number of core structural and organizational positions. Therefore, they are characterized by a conservative life strategy. Most of them have relatively large size, demanding large spaces, stable conditions, restricted ration, have low reproducibility. Most of the fauna include species of Siberian (Sb) (13.42%) and Arctic (Ar) (10.74%) fauna’s type, but only because of migrant and wintering birds. Fewer shows fauna of the Mediterranean (Md) type (8.72%), it’s areal of habitat is partially in contact with the territory of the republic, capturing only its southern regions with their upper boundaries. That’s why it is represented only by nesting species and stray birds. Because of zonal barriers its composition in the native fauna is limited to the variety of species and their participation in the structures of topical and seasonal life. Among them, there is no typical migrant and exclusively wintering species. Most of them are nesting wetland species, typical for the area in terms of natural zoning. This type of fauna is characterized by high volatility and instability, as well as strong desire to infiltrate the northern spaes and the composition of their communities. This fauna is generally conservative, but does not have high success territorial consolidation, and therefore in it behavior is dependent on natural scenarios. Comparing the status and the environmental positions of indigenous origin species of Eu and Tp faunas can be seen that the last act in their choice quite free and easy in terms of their spatial and temporal parameters, while the first are more conservative and inert in the procedural dynamics. Features traits of fauna’s types determine their distribution, landscape and biotopical dependence, the number and reaction to the variability of environmental conditions. According to the indicative features of these groups fauna suffered a lot because of the very scanty Md type (3.52%). Then Mn type (2,35%) is more sustainable, but secondary to participate in the formation and faunal species positions. The same number lost by the Ar fauna type, which featured only stray species and migrants. And because of the Eu type, whose representatives in fauna are more than the rest. Tactics of the Tp fauna was the most justified, because by its fauna has missed only 0.59% of the species, most of which were represented by trees and shrub biotope complex. In general, the fauna thinned mainly due to stray species and less nesting. A small fraction of it is because of migrants. All natural systems have lost about an equal number of species because of the magnitude of the human activity. Total 21 species disappeared from the fauna: nesting (n) - 7 (4.11%), migrants (t) - 2 (1.18%), vagrants (e) - 12 (7.06%), wetlands (W) - 8 (4.71%), open spaces (O) - 6 (3.53 %), forest and bush (F) - 7 (4,11%). The work was performed within the fundamental project 15.187.0211F at the Institute of Zoology of A.S.M.