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    Jędrzejewski W, Jędrzejewska B, Schmidt K, Okarma H, Kowalczyk R. 1999. Ekologia rysia (Lynx lynx) w Puszczy Białowieskiej. Wiadomości Ekologiczne 45 : 17-41.
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    Karbowiak G, Stanko M, Rychlik L, Nowakowski W, Siuda K. 1999. The new data about zoonotic reservoir of Babesia microti in small mammals in Poland. Acta Parasitologica 44 : 142-144.
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    Lanszki J, Körmendi S, Hancz C, Zalewski A. 1999. Feeding habits and trophic niche overlap in a Carnivora community of Hungary. Acta Theriologica 44 : 429-442. DOI: 10.4098/AT.arch.99-41 PDF
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    Pugacewicz E, Zub K. 1999. Liczebność, rozród oraz pokarm sowy błotnej Asio flammeus w Kotlinie Biebrzańskiej. Notatki Ornitologiczne 40 : 69-77.
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    Rychlik L. 1999. Changes in prey size preferences during successive stages of foraging in the mediterranean water shrew Neomys anomalus. Behaviour 136 : 345-365.
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    Rychlik L. 1999. Food handling by the gregarious Mediterranean water shrew Neomys anomalus. Folia Zoologica 48 : 161-172.
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    Schmidt K. 1999. Variation in daily activity of the free-living Eurasian lynx (Lynx lynx) in Białowieża Primeval Forest, Poland. Journal of Zoology, London 249 : 417-425.
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    Szuma E. 1999. Dental abnormalities in the red fox Vulpes vulpes from Poland. Acta Theriologica 44 : 393-412. DOI: 10.4098/AT.arch.99-38
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    Zalewski A. 1999. Identifying sex and individuals of pine marten using snow track measurements. Wildlife Society Bulletin 27 : 28-31.
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    Krasiński ZA, Krasińska M. 1999. Free-ranging populations of lowland European bison in the Białowieża Forest. Parki Narodowe i Rezerwaty Przyrody 18 : 3-75.