Dietary specifications reflect the feeding behaviour of the European otter (Lutra lutra) in “Strandzha” Natural Park (Bulgaria)
Natchev, Nikolay, Petkov, Zahari, Dashev, Georgi, Atanasova, Ivanka, Chipev, Nesho
Notes on the hatching phases and the size of the juveniles in the Snake-eyed skink Ablepharus kitaibelii (Bibron & Bory de Saint-Vincent, 1833)
Vergilov, Vladislav, Natchev, Nikolay
Elemental composition of surface soils in Nature Park Shumen Plateau and Shumen City, Bulgaria
Koleva, Vanya, Koynova, Teodora, Dragoeva, Asya, Natchev, Nikolay
New data on the presence of the Blotched snake (Elaphe sauromates Pallas, 1814) in the region of Shumen town (Bulgaria), with emphasis on the negative human attitude toward the species
Marinova, Pavlina, Koynova, Teodora, Tsvetkov, Radoslav, Natchev, Nikolay