Migratory state: body mass and fat level of some passerine long-distance migrants during autumn migration in north-eastern Bulgaria
Mihaela Ilieva, Pavel Zehtindjiev
Directional behaviour of the Sedge Warbler (Acrocephalus schoenobaenus) studied in two types of orientation cages during autumn migration - a case study
Pavel Zehtindjiev, Mihaela Ilieva, Agnieszka Ożarowska, Przemysław Busse
Body Condition and Fat Score in Local and Passage Populations of the Great Reed Warbler (Acrocephalus arundinaceus) During the Spring Migration in NE Bulgaria
Pavel Zehtindjiev