The coastal zone of the southern part of Crimea is the main winter habitat for hydrophilic birds. In this region, the species and quantitative composition of birds have been studied quite fully including in conditions of the extreme cold snap. A comparison of wintering features in warm and cold winters is of interest to clarify the influence of weather conditions on the state of ornithological complexes and the dynamics of intra-regional movements of birds. Identify the species composition, abundance, and biotopicdistribution of hydrophilic birds in the southern part of the Crimean Peninsulain mild winter was the aim of this research. The studies were carried out in the area from the village Primorsky near Feodosia to Sevastopol (about 250 km) in the winter 2019/2020 which is characterized by the prevalence of positive temperatures. The main coastal biotopes: water area near the open coasts, closed bays, and liman lakes were surveyed. Off the open coasts, 24 species were revealed, which is significantly less than in the cold seasons (for comparison: 41 species wintered here in the cold January-February 2012). The Lari and Anseriformes dominated in species diversity. High numbers and active longshore migration of the Levantine Shearwater and Great Cormorant were recorded. The number of Anseriformes, Coot, and some gulls were lower than in cold winters. In the Sevastopol bays, 29 species were recorded (for comparison: 35 species wintered in this area in cold January 2008). The Anseriformes and Lari were the leaders in species diversity, and Coot and Black-headed Gull were the most abundant. At the liman lakes, 24 wintering species were recorded;Coot and Аnseriformes, mainly Common Pochard, dominated in numbers. In total, 44 bird species (61.1% wintering in the region) from 11 orders were found in all studied biotopes in the mild winter 2019/2020. The low species diversity, typical for mild winters, become apparent near the open coasts, where the contrast of abundance was expressed under normal and extreme weather conditions, which is typical for Аnseriformes, Coot, and some gulls. The high numbers of Levantine Shearwater, the wintering of Red-throated Diver, Parasitic Jaeger, and Bewick'sSwan were the features of mild winter 2019/2020.