The year of 1927 can be regarded as the starting point in the studying of the reserve invertebrates, when first collections of Heteroptera were made on its territory. Since the mid 60s the research has become continuous and systematic. Scientists began to study specific composition, structure of the invertebrates association in soils, plants, different types of reservoirs as well as parasitocomplexes of separate species of vertebrate animals and landscapes, some ecologic issues (stational distribution, diet, quantitative dynamics, etc.).
The results of the reserve parasitologists, hydrobiologists, entomologists hard work and their colleagues from the Institute of Zoology of the Belarussian Academy of Sciences, the Belarussian State University and other concerned organizations enables to speak about 3662 invertebrate species in the Reserve's fauna, belonging to the following types: Sarcomastigophora, Sporozoa, Microspora, Ciliophora, Plathelmintes, Acanthocephales, Nemathelminthes, Annelida, Arthropoda, Mollusca.
42 of 85 invertebrate recorded into the national Red Data Book can be found in the Berezinsky Reserve.