K hniezdnej denzite a neobvyklému hniezdnemu správaniu Certhia brachydactyla na západnom Slovensku

Breeding and breeding density was studied in the Short-toed Treecreeper (Certhia brachydactyla) in two sites (riparian forest and park habitat) in Western Slovakia in 2015–2020. The breeding density was 3–5 nests (mean 4.2, i.e. 2.63 nests/10 ha, the highest 3.13/10 ha in 2018 and 2020) in riparian forest (16 ha study plot, near Piešťany town), using the nest mapping method, and 3–4 males (mean 3.2, i.e. 4.4 males/10 ha) in old park in Nitra town (7.2 ha), using the territories mapping method. The nests were built in trees 1–7.2 m high (mean 2.5 m, n = 32) in riparian forest and they were located mostly in poplar (15) and willow (4). Two nests were found only seven meters each of other and three adult individuals were feeding the young in these two nests. Hence, probably two females fed own young and one male fed young in both nests during two days before their fledging (April 25 and 26, 2020).