1. Fauna, Spatial Distribution, and Ecological Peculiarities of Oligohaetes (Oligochaeta) and Leeches (Hirudinea) in the Ob’ River Basin

   • E. N. Krylova
   • D. M. Bezmaternykh

   OriginalPaper 21 February 2020 Pages: 1001 - 1011

   

2. Earthworm Populations (Oligochaeta, Lumbricidae) in the Basin of the Middle Reaches of the Bol’shaya Laba River (Northwestern Caucasus, Buffer Zone of Caucasian Nature Reserve)

   • I. B. Rapoport
   • N. L. Tsepkova

   OriginalPaper 21 February 2020 Pages: 1012 - 1029

   

3. The Adaptive Morphology of Byssus in Mytilus coruscus, Crenomytilus grayanus, and Modiolus modiolus (Mytilidae, Bivalvia) from the Sea of Japan

   • E. E. Vekhova

   OriginalPaper 21 February 2020 Pages: 1030 - 1044

   

4. Notes on Bithynia contortrix Lindholm 1909 (Caenogastropoda, Bithynidae) from the Lake Baikal Region

   • T. Ya. Sitnikova
   • N. V. Bazova

   OriginalPaper 21 February 2020 Pages: 1045 - 1051

   

5. Distribution of Slugs of the Genus Arion Férussac 1819 (Pulmonata, Arionidae) in Western Siberia

   • A. V. Udaloi
   • S. V. Lukyantsev

   OriginalPaper 21 February 2020 Pages: 1052 - 1058

   

6. Organization of Exploratory Behavior in Danio rerio (Hamilton 1822, Cyprinidae) in a Maze

   • O. M. Zheltova
   • V. A. Nepomnyashchikh

   OriginalPaper 21 February 2020 Pages: 1059 - 1064

7. Behavior of Perch Fry Perca fluviatilis (Percidae) in a Heterothermal Environment at Different Levels of Food Availability

   • A. K. Smirnov
   • E. S. Smirnova

   OriginalPaper 21 February 2020 Pages: 1065 - 1074

   

8. Nesting Biology of the Scaly-Sided Merganser (Mergus squamatus, Mergini, Anatidae) in Primorye, Russia

   • D. V. Solovyeva
   • S. L. Vartanyan

   OriginalPaper 21 February 2020 Pages: 1075 - 1083

   

9. The Structure and Numbers Dynamics of the Urban Goldeneye (Bucephala clangula, Anseriformes, Anatidae) Population in Moscow

   • K. V. Avilova

   OriginalPaper 21 February 2020 Pages: 1084 - 1096

   

10. Cumulative Effect of Trophic and Weather–Climatic Factors on the Population Dynamics of the Vole-Eating Birds of Prey in Their Breeding Habitats

    • A. V. Sharikov
    • S. V. Volkov
    • V. V. Buslakov

    OriginalPaper 21 February 2020 Pages: 1097 - 1107

    

11. Ecology of an Urban Population of the Slaty-Backed Gull (Larus schistisagus) in Comparison with Natural Colonies: 1. Features of Nest Location and Productivity

    • L. A. Zelenskaya

    OriginalPaper 21 February 2020 Pages: 1108 - 1123

    

12. Monitoring Surveys of the Parakeet Auklet (Aethia psittacula, Charadriiformes, Alcidae): Daily and Seasonal Attendance Patterns in North Pacific Colonies

    • N. B. Konyukhov

    OriginalPaper 21 February 2020 Pages: 1124 - 1130

    

13. Technogenic Noise Affects the Minimum Frequency of Chaffinch Song Components (Fringilla coelebs) in the Moscow Population

    • I. V. Kislyakov
    • V. V. Ivanitskii

    OriginalPaper 21 February 2020 Pages: 1131 - 1135

    

14. The Dynamics of Body Temperature of the Eastern European Hedgehog (Erinaceus roumanicus) during Winter Hibernation

    • M. V. Rutovskaya
    • M. E. Diatroptov
    • A. V. Surov

    OriginalPaper 21 February 2020 Pages: 1136 - 1145

    

15. Estimation of the Numbers of the Far Eastern Leopard (Panthera pardus) in Russia

    • V. S. Lukarevskiy
    • S. V. Lukarevskiy

    OriginalPaper 21 February 2020 Pages: 1146 - 1155

    

16. Phenology of the Pacific Walrus (Odobenus rosmarus divergens) in Coastal Waters of Wrangel Island: The Impact of the Sea Ice Dynamics

    • A. A. Kochnev

    OriginalPaper 21 February 2020 Pages: 1156 - 1164

    

17. Use of the Lake Ladoga Area by the Ladoga Seal (Pusa hispida ladogensis) in the Autumn–Winter Period Based on Satellite Telemetry Data

    • D. M. Glazov
    • D. M. Kuznetsova
    • V. V. Rozhnov

    OriginalPaper 21 February 2020 Pages: 1165 - 1171

    

18. Daily and Seasonal Feeding Activity of the Greater Mole-Rat (Spalax microphtalmus, Rodentia, Spalacidae)

    • A. V. Andreychev

    OriginalPaper 21 February 2020 Pages: 1172 - 1181

    

19. Experimental Comparative Analysis of Hunting Behavior in Four Species of Cricetinae Hamsters

    • J. V. Levenets
    • S. N. Panteleeva
    • A. V. Surov

    OriginalPaper 21 February 2020 Pages: 1182 - 1191

    

20. Terrestrial Mammals on Islands Located in the Pechora Sea

    • V. V. Anufriev

    OriginalPaper 21 February 2020 Pages: 1192 - 1197