A waterbird using rivers, ponds, rice fields and other wetlands.
Adults have a conspicuous red forehead and yellow bill tip.
Waterside plants provide nesting sites for common moorhens. In two areas of southwestern Poland, about 92% of recorded nests stood among reeds or cattails. Other sites included sedges, rushes and willow branches trailing into the water.
A 1993 report compared Wielikąt fish ponds and channels, studied in 1982–1989, with industrial ponds at Bytom-Rozbark, studied in 1983, 1987 and 1989. Waves and water-level changes flooded some nests in the fish-pond area. Such losses were not recorded at the industrial ponds, which had broad fringes of waterside vegetation. The arrangement of open water and vegetation created different conditions around nests.
An extinction-risk assessment has not been added yet.
Japan’s assessment published in March 2026 reports a continuing moorhen decline since the 1970s. Suggested causes include wetland development, drying and associated vegetation change, and reduced aquatic food resources following paddy-field improvement. Retaining waterside vegetation and habitats for aquatic organisms is therefore a conservation priority in Japan.