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Hawks are birds of prey of the family Accipitridae. They are widely distributed and are found on all continents except Antarctica. * The
subfamily In biological classification, a subfamily (Latin: ', plural ') is an auxiliary (intermediate) taxonomic rank, next below family but more inclusive than genus Genus ( plural genera ) is a taxonomic rank used in the biological classifica ...
Accipitrinae includes goshawks, sparrowhawks, sharp-shinned hawks and others. This subfamily are mainly woodland birds with long tails and high visual acuity. They hunt by dashing suddenly from a concealed perch. * In America, members of the '' Buteo'' group are also called hawks; this group is called buzzards in other parts of the world. Generally, buteos have broad wings and sturdy builds. They are relatively larger-winged, shorter-tailed and fly further distances in open areas than accipiters. Buteos descend or pounce on their prey rather than hunting in a fast horizontal pursuit. The terms ''accipitrine hawk'' and ''buteonine hawk'' are used to distinguish between the types in regions where ''hawk'' applies to both. The term ''"true hawk"'' is sometimes used for the accipitrine hawks in regions where ''buzzard'' is preferred for the buteonine hawks. All these groups are members of the family Accipitridae, which includes the hawks and buzzards as well as kites, harriers and
eagle Eagle is the common name for many large birds of prey of the family Accipitridae. Eagles belong to several groups of genera, some of which are closely related. Most of the 68 species of eagle are from Eurasia and Africa. Outside this area, j ...
s. To confuse things further, some authors use "hawk" generally for any small to medium Accipitrid that is not an eagle. Debus writes that the osprey is "a large aquatic hawk, with adaptations for catching fish by plunge-diving into water"; the elanid kites are "small, gull-like, grey-and-white hawks with black forewing patches"; and, of the harriers, that the "hawks in this cosmopolitan genus ('circling hawk') are so-called because of their low harrying flight". But he refers to the "typical or milvine kites" as "large kites", not hawks. The common names of some birds include the term "hawk", reflecting traditional usage rather than taxonomy. For example, some people may call an
osprey The osprey (''Pandion haliaetus''), , also called sea hawk, river hawk, and fish hawk, is a diurnal, fish-eating bird of prey with a cosmopolitan range. It is a large raptor reaching more than in length and across the wings. It is brown o ...
a " fish hawk" or a peregrine falcon a " duck hawk".


History

Falconry Falconry is the hunting of wild animals in their natural state and habitat by means of a trained bird of prey. Small animals are hunted; squirrels and rabbits often fall prey to these birds. Two traditional terms are used to describe a person ...
was once called "hawking" and any bird used for falconry could be referred to as a hawk. Aristotle listed eleven types of (''hierakes'', hawks, singular ''hierax''): aisalōn (merlin), asterias, hypotriorchēs, kirkos, leios, perkos, phassophonos, phrynologos, pternis, spizias, and triorchēs. Pliny numbered sixteen kinds of hawks, but named only aigithos, epileios, kenchrēïs (kestrel), kybindis, and triorchēs (buzzard).


Groups


''Accipiter'' group

The accipitrine hawks generally hunt birds as their primary prey. They are also called "hen-hawks", or "wood-hawks" because of their
woodland A woodland () is, in the broad sense, land covered with trees, or in a narrow sense, synonymous with wood (or in the U.S., the '' plurale tantum'' woods), a low-density forest forming open habitats with plenty of sunlight and limited shade (see ...
habitat In ecology, the term habitat summarises the array of resources, physical and biotic factors that are present in an area, such as to support the survival and reproduction of a particular species. A species habitat can be seen as the physical ...
. The
subfamily In biological classification, a subfamily (Latin: ', plural ') is an auxiliary (intermediate) taxonomic rank, next below family but more inclusive than genus Genus ( plural genera ) is a taxonomic rank used in the biological classifica ...
Accipitrinae contains '' Accipiter;'' it also contains
genera 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 nomenclat ...
'' Micronisus'' (Gabar goshawk), '' Urotriorchis'' (long-tailed hawk), and ''
Megatriorchis Doria's goshawk or Doria's hawk, (''Megatriorchis doriae'') is a raptor, the only member of the genus ''Megatriorchis''. Description At up to 69 cm long, it is among the biggest hawks in the broad sense. It is greyish-brown with a black-ba ...
'' (Doria's goshawk). ''
Melierax ''Melierax'' is a genus of bird of prey in the family Accipitridae. Established by George Robert Gray in 1840, it contains the following species: The name ''Melierax'' is a combination of the Greek Greek may refer to: Greece Anything of, fr ...
'' (chanting goshawks) may be included in the subfamily, or given a subfamily of its own. '' Erythrotriorchis'' (the red and chestnut-shouldered goshawks) is traditionally included in Accipitridae, but is possibly a convergent genus from an unrelated group (see red goshawk taxonomy).


''Buteo'' group

The " ''Buteo'' group" includes genera '' Buteo'', ''
Parabuteo ''Parabuteo'' is a genus of bird of prey in the family Accipitridae The Accipitridae is one of the three families within the order Accipitriformes, and is a family of small to large birds with strongly hooked bills and variable morphology bas ...
'', '' Geranoetus'', and most of '' Leucopternis''. Members of this group have also been called "hawk-buzzards". Proposed new genera ''Morphnarchus'', ''Rupornis'', and ''Pseudastur'' are formed from members of ''Buteo'' and ''Leucopternis''. The "'' Buteogallus'' group" are also called hawks, with the exception of the solitary eagles. ''Buteo'' is the type genus of the subfamily Buteoninae. Traditionally this subfamily also includes eagles and sea-eagles. Lerner and Mindell (2005) proposed placing those into separate subfamilies (Aquilinae, Haliaaetinae), leaving only the buteonine hawks/buzzards in Buteoninae.


Characteristics


Intelligence

In February 2005, Canadian
ornithologist Ornithology is a branch of zoology that concerns the "methodological study and consequent knowledge of birds with all that relates to them." Several aspects of ornithology differ from related disciplines, due partly to the high visibility and th ...
Louis Lefebvre announced a method of measuring avian " IQ" by measuring their innovation in feeding habits. Based on this scale, hawks were named among the most intelligent birds. The hawk is very intelligent towards humans and other hawks.


Eyesight

Hawks, like most birds, are
tetrachromat Tetrachromacy (from Greek ''tetra'', meaning "four" and ''chromo'', meaning "color") is the condition of possessing four independent channels for conveying color information, or possessing four types of cone cell in the eye. Organisms with te ...
s having four types of colour receptors in the eye. These give hawks the ability to perceive not only the visible range but also
ultraviolet Ultraviolet (UV) is a form of electromagnetic radiation with wavelength from 10 nm (with a corresponding frequency around 30  PHz) to 400 nm (750  THz), shorter than that of visible light, but longer than X-rays. UV radiation ...
light. Other adaptations allow for the detection of polarised light or magnetic fields. This is due to the large number of photoreceptors in the
retina The retina (from la, rete "net") is the innermost, light-sensitive layer of tissue of the eye of most vertebrates and some molluscs. The optics of the eye create a focused two-dimensional image of the visual world on the retina, which the ...
(up to 1,000,000 per square mm in ''Buteo'', compared to 200,000 in
humans" \n\n\n\n\nThe robots exclusion standard, also known as the robots exclusion protocol or simply robots.txt, is a standard used by websites to indicate to visiting web crawlers and other web robots which portions of the site they are allowed to visi ...
), a high number of nerves connecting these receptors to the brain, and an indented
fovea Fovea () (Latin for "pit"; plural foveae ) is a term in anatomy. It refers to a pit or depression in a structure. Human anatomy *Fovea centralis of the retina * Fovea buccalis or Dimple * Fovea of the femoral head * Trochlear fovea of the fr ...
, which magnifies the central portion of the
visual field The visual field is the "spatial array of visual sensations available to observation in introspectionist psychological experiments". Or simply, visual field can be defined as the entire area that can be seen when an eye is fixed straight at a poin ...
.


Migration

Like most birds, the hawk migrates in the autumn and the spring. Different types of hawks choose separate times in each season to migrate. The autumn migrating season begins in August and ends mid-December. It has been studied that there are longer migration distances than others. The long-distance travelers tend to begin in early autumn while the short distance travelers start much later. Thus, the longer the distance the earlier the bird begins its journey. There have been studies on the speed and efficiency of the bird's migration that show that it is better for a hawk to arrive at its destination as early as possible. This is because the first bird that arrives has the first pick of mates, living area, food, and survival necessities. The more fat a bird has when it starts its migration, the better chance it has of making the trip safely. Kerlinger states that studies have shown that a bird has more body fat when it begins its migration, before it leaves, than when has arrived at its destination. One of the most important parts of the hawk's migration is the flight direction because the direction or path the bird chooses to take could greatly affect its migration. The force of wind is a variable because it could either throw the bird off course or push it in the right direction, depending on the direction of the wind. To ensure a safer journey, a hawk tries to avoid any large bodies of water in the spring and fall by detouring around a lake or flying along a border. Hawkwatching is a citizen scientist activity that monitors hawk migration and provides data to the scientific community.


Habitat and distribution

The red-tailed hawk is the most common hawk in
North America North America is a continent in the Northern Hemisphere and almost entirely within the Western Hemisphere. It is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the southeast by South America and th ...
. Past observations have indicated that while hawks can easily adapt to any surrounding, hawks prefer a habitat that is open. Hawks usually like to live in places like deserts and fields, likely as it is easier to find prey. As they are able to live anywhere, they can be found in mountainous plains and tropical, moist areas. Hawks have been found in places such as
Central America Central America ( es, América Central or ) is a subregion of the Americas. Its boundaries are defined as bordering the United States to the north, Colombia to the south, the Caribbean Sea to the east, and the Pacific Ocean to the west. ...
, the
West Indies The West Indies is a subregion of North America, surrounded by the North Atlantic Ocean and the Caribbean Sea that includes 13 independent island countries and 18 dependencies and other territories in three major archipelagos: the Greate ...
, and
Jamaica Jamaica (; ) is an island country situated in the Caribbean Sea. Spanning in area, it is the third-largest island of the Greater Antilles and the Caribbean (after Cuba and Hispaniola). Jamaica lies about south of Cuba, and west of Hispa ...
.


Behavior

Starting in the hawk's early life, it is fed by its parents until it leaves the nest. The young hawk, while still in its fledgling phase, will leave its nest as early as six weeks old. Once the bird is older it begins to hunt. The hawk kills its prey with its talons as opposed to other
predator 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 t ...
birds 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 lightweigh ...
, such as the
falcon Falcons () are birds of prey in the genus ''Falco'', which includes about 40 species. Falcons are widely distributed on all continents of the world except Antarctica, though closely related raptors did occur there in the Eocene. Adult falcons ...
. The falcon uses its talons to catch the prey but kills the small animal with its beak instead of its talons. The hawk's preferred time for hunting is usually just before nightfall when daylight lessens. Although the hawk is known for being a violent
predator 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 t ...
, some are gentle and quiet. When it flies, the hawk flaps its wings rapidly, and then uses that momentum to glide smoothly and gracefully through the air. The idea of flocking during migration has been closely analyzed, and it has been concluded that it is a commutative tool used by birds and other animals to increase survival. It has become clear to observers that a hawk traveling in a flock has a greater chance of survival than if it travelled alone. Another word used in the
United States The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country Continental United States, primarily located in North America. It consists of 50 U.S. state, states, a Washington, D.C., ...
that has the same meaning as "flock", particularly in terms of groups of hawks, is "kettle".


Reproduction

Hawks are known for their unique mating season. The method the hawk uses to reproduce is different from most. The male and female will fly together in a circular motion. Once they reach a certain height, the male will dive toward the female and then they will raise back to the height again. The two birds will repeat this until finally the male latches onto the female and they begin to free-fall down to earth. In one year, a female hawk will lay about five eggs. Both the male and the female will cater and take care of the eggs for about a month until they hatch. The male and the female create their nest before the mating season and improve it together during the nesting season. The two birds usually make their nest prior to mating. Some species of hawks tend to be
monogamous Monogamy ( ) is a form of dyadic relationship in which an individual has only one partner during their lifetime. Alternately, only one partner at any one time ( serial monogamy) — as compared to the various forms of non-monogamy (e.g., pol ...
and stay with the same mating partner their whole lives.


Diet

A hawk's diet is predictable and includes a variety of smaller animals. Some of these small animals include
snakes Snakes are elongated, limbless, carnivorous reptiles of the suborder Serpentes . Like all other squamates, snakes are ectothermic, amniote vertebrates covered in overlapping scales. Many species of snakes have skulls with several more j ...
, lizards,
fish Fish are Aquatic animal, aquatic, craniate, gill-bearing animals that lack Limb (anatomy), limbs with Digit (anatomy), digits. Included in this definition are the living hagfish, lampreys, and Chondrichthyes, cartilaginous and bony fish as we ...
, mice,
rabbits Rabbits, also known as bunnies or bunny rabbits, are small mammals in the family Leporidae (which also contains the hares) of the order Lagomorpha (which also contains the pikas). ''Oryctolagus cuniculus'' includes the European rabbit sp ...
, squirrels,
birds 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 lightweigh ...
, and any other type of small game that is found on the ground. More specifically, a red-shouldered hawk likes to eat smaller birds like doves and bugs like
grasshopper Grasshoppers are a group of insects belonging to the suborder Caelifera. They are among what is possibly the most ancient living group of chewing herbivorous insects, dating back to the early Triassic around 250 million years ago. Grasshopp ...
s and crickets.


In popular culture

A ''
war hawk In politics, a war hawk, or simply hawk, is someone who favors war or continuing to escalate an existing conflict as opposed to other solutions. War hawks are the opposite of doves. The terms are derived by analogy with the birds of the same name ...
'', or simply ''hawk'', is a term used in politics for somebody favoring war. The term reportedly originated during the 1810 debates in Congress over a possible war with Great Britain when Congressman John Randolph called the pro-war faction led by Henry Clay, the 'war-hawks'. Numerous sporting clubs, such as the Atlanta Hawks, the
Hawthorn Hawks The Hawthorn Football Club, nicknamed the Hawks, is a professional Australian rules football club based in Mulgrave, Victoria, that competes in the Australian Football League (AFL). The club was founded in 1902 in the inner-east suburb of Hawth ...
and the Malmö Redhawks, use the bird as an emblem. Miami University in Oxford, Ohio officially became known as the RedHawks in 1997 after formerly being known as the Redskins. Hawks are highly associated with
Guru Gobind Singh Guru Gobind Singh (; 22 December 1666 – 7 October 1708), born Gobind Das or Gobind Rai the tenth Sikh Guru, a spiritual master, warrior, poet and philosopher. When his father, Guru Tegh Bahadur, was executed by Aurangzeb, Guru Gobind Sin ...
in the Sikh community. According to ornithologists, he is believed to have kept a white
Northern Goshawk The northern goshawk (; ''Accipiter gentilis'') is a species of medium-large raptor in the family Accipitridae, a family which also includes other extant diurnal raptors, such as eagles, buzzards and harriers. As a species in the genus '' Acci ...
. This is reflected in that the Northern Goshawk was made the official state bird of
Punjab, India Punjab (; ) is a States and union territories of India, state in northern India. Forming part of the larger Punjab region of the Indian subcontinent, the state is bordered by the States and union territories of India, Indian states of Himachal ...
.


References


External links


Hawks and eagles (Accipitridae)
information, videos, photos and sounds at the Internet Bird Collection * * * {{Authority control Birds of prey Articles containing video clips Bird common names