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: <i>Sorex tundrensis</i> Merriam, 1900, <i>S. caecutiens</i> Laxmann, 1788, <i>S. minutissimus</i> Zimmermann, 1780 and <i>S. minutus</i> Linnaeus, 1766. Data on reproduction, sex and age composition, diet and helminths were given. Among young <i>S. tundrensis</i> 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 <i>Soboliphyme jamesoni</i>.