Oparin Mikhail L. RussiaSaratovSaratov branch of A. N. Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, 24 Rabochaya Str., Saratov 410028, Russiaoparinml@mail.ru Author's articles Long-term Dynamics of the Community Structure of Larks (Alaudidae, Aves) in the North-Western Caspian Lowland Population Dynamics Factors of Ungulates and Wolves of the Saratov Region in the 21st Century