Haliastur sphenurus
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The whistling kite (''Haliastur sphenurus'') is a medium-sized diurnal
raptor Raptor or RAPTOR may refer to: Animals The word "raptor" refers to several groups of bird-like dinosaurs which primarily capture and subdue/kill prey with their talons. * Raptor (bird) or bird of prey, a bird that primarily hunts and feeds on ...
found throughout Australia (including coastal
islands An island (or isle) is an isolated piece of habitat that is surrounded by a dramatically different habitat, such as water. Very small islands such as emergent land features on atolls can be called islets, skerries, cays or keys. An island ...
), New Caledonia and much of
New Guinea New Guinea (; Hiri Motu: ''Niu Gini''; id, Papua, or , historically ) is the world's second-largest island with an area of . Located in Oceania in the southwestern Pacific Ocean, the island is separated from Australia by the wide Torr ...
(excluding the central mountains and the northwest). Also called the whistling eagle or whistling hawk, it is named for its loud whistling call, which it often gives in
flight Flight or flying is the process by which an object moves through a space without contacting any planetary surface, either within an atmosphere (i.e. air flight or aviation) or through the vacuum of outer space (i.e. spaceflight). This can be a ...
. Some authorities put this species in the
genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of living and fossil organisms as well as viruses. In the hierarchy of biological classification, genus comes above species and below family. In binomial nom ...
''
Milvus ''Milvus'' is a genus of medium-sized birds of prey. The genus was erected by the French naturalist Bernard Germain de Lacépède in 1799 with the red kite as the type species. The name is the Latin word for the red kite. Species This is an Old ...
'', despite marked differences in behaviour,
voice The human voice consists of sound made by a human being using the vocal tract, including talking, singing, laughing, crying, screaming, shouting, humming or yelling. The human voice frequency is specifically a part of human sound producti ...
and plumage between this species and other members of that genus.


Description

The whistling kite ranges in size from , with a
wingspan The wingspan (or just span) of a bird or an airplane is the distance from one wingtip to the other wingtip. For example, the Boeing 777–200 has a wingspan of , and a wandering albatross (''Diomedea exulans'') caught in 1965 had a wingspan o ...
between . Weights range from an average of for males and for females. As with most raptors,
female Female ( symbol: ♀) is the sex of an organism that produces the large non-motile ova (egg cells), the type of gamete (sex cell) that fuses with the male gamete during sexual reproduction. A female has larger gametes than a male. Females ...
s are larger and heavier than
male Male (symbol: ♂) is the sex of an organism that produces the gamete (sex cell) known as sperm, which fuses with the larger female gamete, or ovum, in the process of fertilization. A male organism cannot reproduce sexually without access to ...
s; though there is considerable overlap between the sexes, females can be up to 21% larger and 42% heavier. Southern birds are also larger than those found in the tropics. Male and female plumages are the same. Adult birds are a pale buff on the head, breast and tail, with browner wings and black flight feathers. Immature birds are a heavily streaked reddish-brown with prominent pale spots on the wings. Throughout their lives, whistling kites have bone-colored legs and feet, which are unfeathered. Overall, the whistling kite looks small-headed and long-tailed, with wingtips falling well short of the tail tip when the bird is perched. Though its legs are short, the bird walks easily on the ground. Whistling kites soar on slightly bowed wings, with their long flight feathers often well-splayed. The striking pattern on their underwings is distinctive.


Voice

This is a noisy species, calling regularly in flight and while perched—even while at the
nest A nest is a structure built for certain animals to hold eggs or young. Although nests are most closely associated with birds, members of all classes of vertebrates and some invertebrates construct nests. They may be composed of organic materi ...
. Its most common call is a clear descending whistle, often followed (less often preceded) by a rapid series of rising notes. Intriguingly, field research carried out in Taunton Scientific National Park, Central
Queensland ) , nickname = Sunshine State , image_map = Queensland in Australia.svg , map_caption = Location of Queensland in Australia , subdivision_type = Country , subdivision_name = Australia , established_title = Before federation , establishe ...
by Fiona Randall from the
University of Edinburgh The University of Edinburgh ( sco, University o Edinburgh, gd, Oilthigh Dhùn Èideann; abbreviated as ''Edin.'' in post-nominals) is a public research university based in Edinburgh, Scotland. Granted a royal charter by King James VI in 15 ...
,
Scotland Scotland (, ) is a Countries of the United Kingdom, country that is part of the United Kingdom. Covering the northern third of the island of Great Britain, mainland Scotland has a Anglo-Scottish border, border with England to the southeast ...
has shown that spotted bowerbirds (''Chlamydera maculata'') in that park regularly mimic the calls of whistling kites, with the frequency of mimicry increasing as the breeding season progresses. The function of this mimicry is unknown.


Habitat

A species of open or lightly wooded areas, whistling kites are typically found near water, at elevations ranging from sea level to 1400 meters. Though the species as a whole is generally sedentary, some Australian birds are known to be nomadic, wandering to
coastal The coast, also known as the coastline or seashore, is defined as the area where land meets the ocean, or as a line that forms the boundary between the land and the coastline. The Earth has around of coastline. Coasts are important zones in ...
areas in northern Australia during the
dry season The dry season is a yearly period of low rainfall, especially in the tropics. The weather in the tropics is dominated by the tropical rain belt, which moves from the northern to the southern tropics and back over the course of the year. The te ...
; some south Australian birds migrate to the south in the autumn. There is some evidence that the species is declining locally in southern Australia due to the drainage of wetlands and an accompanying decline in food supplies.


Behaviour

Whistling kites tend to be found singly or in pairs, but sometimes gather in larger groups, particularly during nomadic movements, at roost sites and at sources of plentiful food.


Feeding

Whistling kites are truly catholic in their tastes, taking small mammals,
bird Birds are a group of warm-blooded vertebrates constituting the class Aves (), characterised by feathers, toothless beaked jaws, the laying of hard-shelled eggs, a high metabolic rate, a four-chambered heart, and a strong yet lightweig ...
s,
fish Fish are aquatic, craniate, gill-bearing animals that lack limbs with digits. Included in this definition are the living hagfish, lampreys, and cartilaginous and bony fish as well as various extinct related groups. Approximately 95% of ...
, reptiles, amphibians,
crustacean Crustaceans (Crustacea, ) form a large, diverse arthropod taxon which includes such animals as decapods, seed shrimp, branchiopods, fish lice, krill, remipedes, isopods, barnacles, copepods, amphipods and mantis shrimp. The crustacean group can ...
s,
insect Insects (from Latin ') are pancrustacean hexapod invertebrates of the class Insecta. They are the largest group within the arthropod phylum. Insects have a chitinous exoskeleton, a three-part body ( head, thorax and abdomen), three ...
s and carrion. Those in Australia tend to take primarily live
prey Predation is a biological interaction where one organism, the predator, kills and eats another organism, its prey. It is one of a family of common feeding behaviours that includes parasitism and micropredation (which usually do not kill ...
(except in the winter, when they subsist largely on carrion), while those in New Guinea are principally scavengers. Most food items are taken either from the ground or from the water surface, though insects are sometimes hawked directly from the air. Whistling kites are also known to pirate meals from
ibis The ibises () (collective plural ibis; classical plurals ibides and ibes) are a group of long-legged wading birds in the family Threskiornithidae, that inhabit wetlands, forests and plains. "Ibis" derives from the Latin and Ancient Greek word ...
es and herons and from other raptors, and to force large waterbirds to regurgitate their catches. They regularly patrol roads in search of roadkill, and hover over the edges of grass fires in search of potential prey fleeing the flames, sometimes carrying burning sticks and dropping them on unburnt areas. When food is scarce they will almost entirely rely on finding carrion.


Breeding

The whistling kite's nest is a bulky platform made of sticks and lined with green leaves, placed in an upright fork of a tall
tree In botany, a tree is a perennial plant with an elongated stem, or trunk, usually supporting branches and leaves. In some usages, the definition of a tree may be narrower, including only woody plants with secondary growth, plants that are ...
—often a
eucalypt Eucalypt is a descriptive name for woody plants with capsule fruiting bodies belonging to seven closely related genera (of the tribe Eucalypteae) found across Australasia: ''Eucalyptus'', ''Corymbia'', ''Angophora'', '' Stockwellia'', ''Allosyn ...
or
pine A pine is any conifer tree or shrub in the genus ''Pinus'' () of the family Pinaceae. ''Pinus'' is the sole genus in the subfamily Pinoideae. The World Flora Online created by the Royal Botanic Gardens, Kew and Missouri Botanical Garden accepts ...
in a
riparian A riparian zone or riparian area is the interface between land and a river or stream. Riparian is also the proper nomenclature for one of the terrestrial biomes of the Earth. Plant habitats and communities along the river margins and banks a ...
area. Pairs often re-use the same nest year after year, annually adding material until the platform becomes quite large. Females normally lay 2–3 bluish-white
eggs Humans and human ancestors have scavenged and eaten animal eggs for millions of years. Humans in Southeast Asia had domesticated chickens and harvested their eggs for food by 1,500 BCE. The most widely consumed eggs are those of fowl, especial ...
, which are sometimes covered with reddish-brown blotches; clutches of 1–4 eggs have been recorded. Eggs are incubated for 35–40 days, and the species is reported to have a 60% hatching success. Chicks, which are covered with cream- or buff-colored down feathers, spend 44–54 days in the nest before fledging, and are dependent on their parents for a further 6–8 weeks after leaving the nest. In Australia, the birds generally breed between June and October in the south, and between February and May in the north, though they may nest at any time after rain providing there are adequate food supplies.


References


External links


"Vocal Mimicry in Spotted Bowerbirds" - Field study report by Fiona Randall discussing mimicry of Whistling Kites

Whistling Kite videos on the Internet Bird Collection


{{Taxonbar, from=Q606512
whistling kite The whistling kite (''Haliastur sphenurus'') is a medium-sized diurnal raptor found throughout Australia (including coastal islands), New Caledonia and much of New Guinea (excluding the central mountains and the northwest). Also called the whistl ...
whistling kite The whistling kite (''Haliastur sphenurus'') is a medium-sized diurnal raptor found throughout Australia (including coastal islands), New Caledonia and much of New Guinea (excluding the central mountains and the northwest). Also called the whistl ...
Birds of Australia Birds of New Guinea Birds of New Caledonia Diurnal raptors of Australia
whistling kite The whistling kite (''Haliastur sphenurus'') is a medium-sized diurnal raptor found throughout Australia (including coastal islands), New Caledonia and much of New Guinea (excluding the central mountains and the northwest). Also called the whistl ...
whistling kite The whistling kite (''Haliastur sphenurus'') is a medium-sized diurnal raptor found throughout Australia (including coastal islands), New Caledonia and much of New Guinea (excluding the central mountains and the northwest). Also called the whistl ...
Articles containing video clips Firehawks