Vol. 47, No. 7, 2020

Biology Bulletin

The Concept of Bird Species: Theory and Practice

E. A. Koblik, Ya. A. Red’kin, S. V. Volkov and A. A. Mosalov p. 707 abstract

Differential Migration of Birds: Diversity and Inconsistency

V. A. Payevsky p. 724 abstract

Centrohelid Heliozoans (Centroplasthelida Febvre-Chevalier et Febvre 1984) from Vietnam

K. I. Prokina, L. V. Radaykina and A. P. Mylnikov p. 735 abstract

Parasites of Common (Sterna hirundo) and Arctic (Sterna paradisaea) Terns (Charadriiformes, Laridae) in Karelia

D. I. Lebedeva, G. A. Yakovleva and A. V. Artem’ev p. 747 abstract

A New Glance at Old Samples: Remains of Freshwater Invertebrates Associated with Mummified Carcasses of Large Quaternary Mammals

A. A. Kotov, A. N. Neretina, A. A. Zharov, E. I. Izymova, G. G. Boeskorov, P. A. Kosintsev and F. K. Shidlovskiy p. 753 abstract

Cucumaria fedotovi, a New Species of Holothurian (Holothuroidea, Dendrochirotida, Cucumariidae) from the Karaginskii Gulf, Bering Sea

E. G. Panina, V. G. Stepanov and A. V. Martynov p. 762 abstract

Rational (Sustainable) Use of Waterfowl Resources: Demographic Status of the Population and Harvest Rates

S. P. Kharitonov p. 771 abstract

Variability of the mtDNA Control Region in the Bean Goose, Anser fabalis Latham 1787, in the Russian Far East

D. V. Volkovsky, P. V. Fisenko and Yu. N. Zhuravlev p. 782 abstract

Dynamics of the Onset of White-Tailed Eagle (Haliaeetus albicilla) Breeding in the Central Part of the Volga–Kama Region and Possible Explanations

R. Kh. Bekmansurov p. 791 abstract

The Singing Behaviour of the Long-Tailed Shrike (Lanius schach erythronotus)

A. S. Opaev p. 801 abstract

Association of Success in Interspecific Rearing of Nestlings with the Width of Trophic Niche of the Recipient Species in Hollow-Nesting Birds

T. A. Ilyina, A. V. Krupitsky and A. V. Bushuev p. 807 abstract

Egg Size as the Main Stimulus to Discriminatory Behavior of the Yellow-Browed Warbler (Phylloscopus inornatus, Phylloscopidae) under Brood Parasitism of the Oriental Cuckoo (Cuculus optatus, Cuculidae)

S. G. Meshcheryagina, G. N. Bachurin, O. V. Bourski and M. G. Golovatin p. 821 abstract

Evaluating the Capability of Mirror Self-Recognition in Hooded Crows (Corvus cornix)

A. A. Smirnova, Yu. A. Kalashnikova, M. V. Samuleeva and Z. A. Zorina p. 836 abstract

Population Dynamics of the Common Shrew (Sorex araneus) (Experience in an Analytical Review of the State of the Problem)

E. V. Ivanter p. 844 abstract

Evolution and Morphological Variability of Cheek Teeth in the Kudaro Cave Bear (Ursus kudarensis, Carnivora, Ursidae)

G. F. Baryshnikov and A. Y. Puzachenko p. 854 abstract

Implications of the Discovery of a Stag Moose (Cervalces sp., Cervidae) Skull with Antler Beams of Different Lengths

P. A. Nikolskiy, A. E. Basilyan, A. M. Anisimov, V. S. Zazhigin, E. Yu. Pavlova and V. V. Pitulko p. 878 abstract

Contents

Biology Bulletin