Abstract
Abstract Wallcreeper Tichodroma muraria was observed during cold winters in different parts of Croatia, along the Adriatic coast, on islands as well as inland. Their origin remains unknown, but they may belong to the population nesting in the Alps or in Dinaric parts of Bosnia and Herzegovina and Montenegro. The overwintering along the Adriatic coast was explored during field observations, but also from the literature and museum data. The field investigations were carried out in Istria, North Dalmatia, Paklenica NP, Kornati NP and central Dalmatia, Krka NP. In total, 96 observations were made: 35 specimens from museum collections and literature and 61 during field research. The Wallcreeper was observed in Velika and Mala Paklenica canyons in Paklenica NP during cold winters, but not during milder winters. In the Paklenica NP, the earliest individuals were observed on 10 Oct and the latest on 28 Apr. On the complete east Adriatic coast and in Croatian inland, the earliest record was made on 6 Sep and the latest on 2 May. There are 5-10 individuals overwintering in Paklenica National Park.
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