Abstract:Actual status, distribution, numbers and threats for four forest bird species -Tengmalm's Owl (Aegolius funereus), Pygmy Owl (Glaucidium passerinum), Three-toed Woodpecker (Picoides tridactylus), and Capercaillie (Tetrao urogallus) were studied in the territory of the Pirin National Park, Bulgaria, in the years 2001and 2019 For the owls, we used night line transect, 2-5 km in length, with acoustic imitation of species calls (henceforth playback) at each 500 (700) m (38 points in 2001-2002, 80 points in 2019). … Show more
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