The nominate race is a regular breeder in open, lowland wetlands. M. f. thunbergi is a passage migrant, M. f. feldegg vagrant since the 1950s and sporadic breeder, M. f. cinereo- capilla rare vagrant (one record). The breeding population showed moderate decline (?1.5 ± 0.8%, p < 0.05) between 1999 and 2018. Migratory (mid-March – mid-October).