The red-kneed dotterel (Erythrogonys cinctus) is a long-legged, medium-sized (length 17–20 cm, wingspan 33–38 cm, weight 40-55 g) plover in a monotypic genus in the subfamily Vanellinae. It is often gregarious and will associate with other waders of its own and different species, even when nesting. It is nomadic and sometimes irruptive.