The knowledge of past bird species diversity in the Late Pleistocene and Holocene periods in the area of present-day Slovenia is limited and restricted to a handful of publications about findings from individual archaeological sites. Therefore, we aimed to collect all available data on findings from Slovenia and supplement it with discoveries from neighboring regions to establish a list as complete as possible of Late Pleistocene bird species diversity in the area. In gathering data on these findings, we primarily relied on published sources. Based on the obtained list of bird species diversity across different past periods, we were able to track changes in the composition of bird fauna and its dependence on climatic and vegetation changes. It became clear that the species composition of birds during the glacial period was, as expected, different from today's. Among the Late Pleistocene findings, there were also some bird species that no longer appear in this area today, such as the willow ptarmigan (Lagopus lagopus), the snowy owl (Bubo scandiacus), and the red-billed chough (Pyrrhocorax pyrrhocorax). On one hand, these were primarily species that are now typical of boreal and even tundra zones of Northern Europe while on the other hand, there were also some southern species of open habitats among them. The species composition among the findings from the interglacial and Holocene periods was, as expected, more similar to that of today.
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