Snacking during hibernation? Winter bat diet and prey availabilities, a case study from Iskar Gorge, Bulgaria by Nia Toshkova, Katrin Dimitrova, Mario Langourov, Boyan Zlatkov, Rostislav Bekchiev, Toshko Ljubomirov, Eberhard Zielke, Radost Angelova, Rossina Parvanova, Tzvetan Simeonov, Nikolay Simov

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