The Stork-billed Kingfisher (Pelargopsis capensis) (formerly Halcyon capensis), is a tree kingfisher which is widely but sparsely distributed in the tropical Indian Subcontinent and Southeast Asia, from India and Sri Lanka to Indonesia. This kingfisher is essentially resident throughout its range. This is a very large kingfisher, measuring 35 to 38 cm (14 to 15 in) in length. The adult has a green back, blue wings and tail, and grey head. Its underparts and neck are buff. The very large bill and legs are bright red. The flight of the Stork-billed Kingfisher is laboured and flapping, but direct. Sexes are similar. There are 15 races, mostly differing in plumage detail, but P. c. gigantea of the Sulu Islands has a white head, neck and underparts. The call of this noisy kingfisher is a low and far reaching peer-por-por repeated every 5 seconds or so as well cackling ke-ke-ke-ke-ke-ke.