Lukáš Poledník, Kateřina Poledníková, Jitka Větrovcová, Václav Beran, Václav Pavel
Between the years 2013 and 2017 six snow tracking surveys were carried out in four different areas (PLA Orlické hory, PLA Šumava, Krkonoše center, Dačicko) of the Czech Republic. Number of individuals identified in different areas varied between 2,1 to 12 adult otters per 100 km2. Higher densities were identified in fishpond areas compared to mountain areas. Dependent cubs accounted for 30% of the populations, and the average litter size in the otter family in winter period was 1,63.