“…Bird migration is a very complicated phenomenon that could be affected by a considerable number of factors (Newton, 2008;Žalakevičius, 2015). One of those could be the climate change, which has been observed around the world (Marquet et al, 2019;Jetz et al, 2019). Without exception, warmer winters and springs have also been observed in Lithuania (Bukantis, Rimkus, 2005;Rimkus et al, 2018).…”