Halcyon is a genus of the tree kingfishers, near passerine birds in the subfamily Halcyoninae.
Halcyon (genus)
Image: Ruddy Kingfisher
Image: Halcyon smyrnensis Singapore Botanic Gardens
Image: Brown breasted Kingfisher, Los Banos, Philippines 1
The tree kingfishers, also called wood kingfishers or Halcyoninae, are the most numerous of the three subfamilies of birds in the kingfisher family, with around 70 species divided into 12 genera, including several species of kookaburras. The subfamily appears to have arisen in Indochina and Maritime Southeast Asia and then spread to many areas around the world. Tree kingfishers are widespread through Asia and Australasia, but also appear in Africa and the islands of the Pacific and Indian Oceans, using a range of habitats from tropical rainforest to open woodlands.
Tree kingfisher
Brown-winged kingfisher, Sundarbans, West Bengal, India
Brown-headed paradise kingfisher
White-throated kingfisher