The Shrews ( <i>Sorex</i>) of the Nadym River Basin (the North of Western Siberia)
Four species of shrews were found in the Nadym River basin: Sorex tundrensis Merriam, 1900, S. caecutiens Laxmann, 1788, S. minutissimus Zimmermann, 1780 and S. minutus Linnaeus, 1766. Data on reproduction, sex and age composition, diet and helminths were given. Among young S. tundrensis the number of females was two times larger than the number of males. Nadym basin was defined as the western boundary for the distribution of nematode Soboliphyme jamesoni.