Breeds in fishponds, reservoirs, marshes, oxbows with dense vegetation. The breeding population was decreasing before the millennium, increasing between 2000 and 2012. The trend was uncertain between 1999 and 2018 (?5.1±13.5%). Spring migration peaks in March–April, autumn in September. Overwintered in the last years. Migration peaks showed increasing values over the previous two decades (43.5±21.7%, p=0.06).