1. The Byssal Apparatus in the Pacific Mussel, Mytilus trossulus (Bivalvia, Mytilidae), from the Sea of Japan

   • E. E. Vekhova

   OriginalPaper 29 December 2021 Pages: 1443 - 1451

   

2. Invasion of the Zebra Mussel Dreissena polymorpha (Pallas, 1771) (Dreissenidae) in Lake Ladoga

   • D. S. Dudakova
   • M. O. Dudakov
   • V. M. Anokhin

   OriginalPaper 29 December 2021 Pages: 1452 - 1461

   

3. Fauna of Freshwater Harpacticoida (Copepoda) in the Lena River Delta

   • A. A. Novikov
   • E. N. Abramova
   • R. M. Sabirov

   OriginalPaper 29 December 2021 Pages: 1462 - 1472

   

4. Zooplankton of the Tsimlyansk Reservoir and Volga–Don Shipping Canal

   • V. I. Lazareva
   • R. Z. Sabitova

   OriginalPaper 29 December 2021 Pages: 1473 - 1486

   

5. Morphometric and Reproductive Features of the Two-Streaked Snake-Eyed Skink (Ablepharus bivittatus (Menetries 1832), Reptilia, Scincidae) in the Talysh Mountains

   • A. A. Kidov
   • T. E. Kondratova

   OriginalPaper 29 December 2021 Pages: 1487 - 1493

   

6. Maximum Body Temperature as a Parameter of Thermoregulation in Reptiles: Experience from a Statistical Evaluation Using the Common Adder (Vipera berus) as an Example

   • A. V. Korosov
   • N. D. Ganyushina

   OriginalPaper 29 December 2021 Pages: 1494 - 1502

   

7. Celestial Orientation in Birds

   • A. D. Zolotareva
   • N. S. Chernetsov

   OriginalPaper 29 December 2021 Pages: 1503 - 1512

   

8. Analysis of the Avifauna Structure in the Alpine Belt of the Northwestern Putorana Plateau, Central Siberia

   • A. A. Romanov
   • E. V. Melikhova
   • V. O. Yakovlev

   OriginalPaper 29 December 2021 Pages: 1513 - 1527

9. The Impact of Changes in Breeding Conditions in the Arctic on the Expansion of the Russian Population of the Barnacle Goose (Branta leucopsis)

   • S. B. Rozenfeld
   • S. V. Volkov
   • M. Yu. Soloviev

   OriginalPaper 29 December 2021 Pages: 1528 - 1540

   

10. Breeding Biology of the Crested Auklet (Aethia cristatella, Alcidae, Charadriiformes) in the Northern Part of the Sea of Okhotsk

    • E. Yu. Golubova

    OriginalPaper 29 December 2021 Pages: 1541 - 1562

    

11. Influence of Heredity on the Location of Wintering Sites, but Not on Migration Routes of Juvenile Imperial Eagles (Aquila heliaca) from the Population of the Volga Region

    • M. V. Korepov
    • M. M. Erokhina

    OriginalPaper 29 December 2021 Pages: 1563 - 1570

    

12. Hibernation Records on the Surface of Rodent Incisors: Intraspecific Variations and Interspecific Differences

    • G. A. Klevezal
    • V. A. Lobkov
    • D. V. Shchepotkin

    OriginalPaper 29 December 2021 Pages: 1571 - 1586

    

13. Influence of Social Conditions on Humoral Adaptive Immunity in Bank (Clethrionomys glareolus) and Gray-Sided (Clethrionomys rufocanus) Voles: An Experimental Study

    • L. B. Kravchenko

    OriginalPaper 29 December 2021 Pages: 1587 - 1598

    

14. Growth and Puberty of Water Boles (Arvicola amphibius, Rodentia, Arvicolinae) in Relation to Birth Season and Family Factors

    • G. G. Nazarova
    • L. P. Proskurnyak
    • E. I. Yuzhik

    OriginalPaper 29 December 2021 Pages: 1599 - 1608

    

15. Fluctuating Asymmetry and Morphogenetic Correlations of the Masticatory Surface Patterns of m1 in Gray Voles (Rodentia, Arvicolinae)

    • V. Yu. Kovaleva
    • A. A. Pozdnyakov
    • V. M. Efimov

    OriginalPaper 29 December 2021 Pages: 1609 - 1622

    

16. Experimental Models of the Dyadic Operant Behavior of Rats in Different Social Contexts

    • E. P. Murtazina
    • I. S. Buyanova (Matiulko)
    • Yu. A. Ginzburg-Shik

    OriginalPaper 29 December 2021 Pages: 1623 - 1630

    

17. Home Range Use by a Male Siberian Musk Deer (Moschus moschiferus L.) in Central Sikhote-Alin

    • V. A. Zaitsev
    • D. A. Maksimova
    • N. V. Belotelov

    OriginalPaper 29 December 2021 Pages: 1631 - 1649

    

18. Marking Activities of the Siberian Roe Deer (Capreolus pygargus, Cervidae) in Central Yakutia

    • A. V. Argunov

    OriginalPaper 29 December 2021 Pages: 1650 - 1657

    

19. Implemented Reproduction of the Taimyr Wild Reindeer (Rangifer tarandus) in Pyasina Migratory Flows in the 2006–2007 Reproductive Cycle

    • A. M. Shapkin
    • N. S. Sukhanova

    OriginalPaper 29 December 2021 Pages: 1658 - 1673

    

20. On Time and Environment of Stephanorhinus kirchbergensis Jäger 1839 (Mammalia, Rhinoceratidae) in Altai and Northeastern Russia

    • I. V. Kirillova
    • A. O. Vershinina
    • B. Shapiro

    OriginalPaper 29 December 2021 Pages: 1674 - 1687

    

21. Cranium Variations between Arctic Foxes (Vulpes lagopus semenovi, Vulpes lagopus beringensis) on the Commander Islands and the Mainland Arctic Fox (Vulpes lagopus lagopus) in Comparison with Interspecies Variations in the Genera Urocyon and Vulpes (Canidae)

    • O. G. Nanova

    OriginalPaper 29 December 2021 Pages: 1688 - 1703

    

22. The Importance of Hauling Grounds in the Life of the Baikal Seals (Pusa sibirica Gmelin 1788, Pinnipedia): 1. Review

    • E. A. Petrov
    • A. B. Kupchinsky
    • A. A. Badardinov

    OriginalPaper 29 December 2021 Pages: 1704 - 1714

    

23. The Importance of Hauling Grounds in the Life of the Baikal Seals (Pusa sibirica Gmelin 1788, Pinnipedia): 2. Behavior on Hauling Grounds

    • E. A. Petrov
    • A. B. Kupchinsky
    • A. A. Badardinov

    OriginalPaper 29 December 2021 Pages: 1715 - 1728

    

24. Cases of Leucism and Melanism in the Caucasian Smooth Newt (Lissotriton lantzi, Amphibia, Caudata, Salamandridae)

    • E. A. Kidova
    • Ya. A. Vyatkin
    • A. A. Kidov

    BRIEF COMMUNICATIONS 29 December 2021 Pages: 1729 - 1731