Near rivers and streams gulls and terns live and eat fish and invertebrates, including dragonflies. One species of grebes, the descendant of Tasmanian population of great crested grebe lives here. There are numerous sandpipers of various families (mainly Scopolacidae and plovers), searching for food in rivers and mossy marshes. Unusual inhabitants of Antarctica are plant-eating charadriiforms, resembling partridges in appearance and habit of life � these are descendants of South American seedsnipes.