Not all kingfishers fish—and blue is a trick of light
Kingfishers (Alcedinidae) are 118 brightly coloured Coraciiformes in three subfamilies and nineteen genera, cosmopolitan yet strongest in tropical Africa, Asia, and Oceania. Large heads, dagger bills, short legs, and stubby tails define them. Over half the species live in forests, and the tree-kingfisher subfamily includes no specialist fish-eaters.
Rafinesque named the family in 1815. Subfamilies are Halcyoninae (tree), Alcedininae (river), and Cerylinae (water); Halcyoninae has naming priority over Daceloninae. The Greek halkyon—"sea-born"—recalls myths that these birds calmed waves while nesting, and Alcyone and Ceyx transformed into kingfishers after shipwreck grief. Diversity centred in Australasia after an Indomalayan origin around twenty-seven million years ago; American species reflect only two colonising events within Cerylinae.
Size spans the African dwarf kingfisher at about ten centimetres and nine to twelve grams up to Africa's giant kingfisher at forty-two to forty-six centimetres, while female laughing kookaburras approach five hundred grams. Most blues and greens come from feather structure scattering light (Tyndall effect), not pigment—except some iridescence in American forms. Fish-hunters wear longer compressed bills; ground-hunters shorter, broader ones. Excellent binocular colour vision corrects for underwater refraction; nictitating membranes—and a bony plate in pied kingfishers—shield eyes on impact.
They nest in bank tunnels or sometimes arboreal termite mounds. Europe and temperate North America hold few residents—essentially the common and belted kingfishers plus sparse extras—while tiny Gambia hosts eight. Common kingfishers stretch from Ireland to the Solomons; Kofiau paradise kingfishers occupy one island. Red-backed kingfishers endure Australian deserts; others use coral atolls, mountains, farms, and city parks. A few island endemics remain extinction-threatened, a reminder that vivid plumage does not guarantee survival.
Source: Kingfisher
