Broad-winged Hawk
Encyclopedia
The Broad-winged Hawk is a small hawk
Hawk
The term hawk can be used in several ways:* In strict usage in Australia and Africa, to mean any of the species in the subfamily Accipitrinae, which comprises the genera Accipiter, Micronisus, Melierax, Urotriorchis and Megatriorchis. The large and widespread Accipiter genus includes goshawks,...

 of the genus
Genus
In biology, a genus is a low-level taxonomic rank used in the biological classification of living and fossil organisms, which is an example of definition by genus and differentia...

 Buteo
Buteo
Buteo is a genus of medium to fairly large, wide-ranging raptors with a robust body and broad wings. In the Old World, members of this genus are called "buzzards", but "hawk" is used in North America...

. During the summer some subspecies
Subspecies
Subspecies in biological classification, is either a taxonomic rank subordinate to species, ora taxonomic unit in that rank . A subspecies cannot be recognized in isolation: a species will either be recognized as having no subspecies at all or two or more, never just one...

 are distributed over eastern North America
North America
North America is a continent wholly within the Northern Hemisphere and almost wholly within the Western Hemisphere. It is also considered a northern subcontinent of the Americas...

, as far west as British Columbia
British Columbia
British Columbia is the westernmost of Canada's provinces and is known for its natural beauty, as reflected in its Latin motto, Splendor sine occasu . Its name was chosen by Queen Victoria in 1858...

 and Texas
Texas
Texas is the second largest U.S. state by both area and population, and the largest state by area in the contiguous United States.The name, based on the Caddo word "Tejas" meaning "friends" or "allies", was applied by the Spanish to the Caddo themselves and to the region of their settlement in...

; they then migrate
Bird migration
Bird migration is the regular seasonal journey undertaken by many species of birds. Bird movements include those made in response to changes in food availability, habitat or weather. Sometimes, journeys are not termed "true migration" because they are irregular or in only one direction...

 south to winter in the neotropics from Mexico
Mexico
The United Mexican States , commonly known as Mexico , is a federal constitutional republic in North America. It is bordered on the north by the United States; on the south and west by the Pacific Ocean; on the southeast by Guatemala, Belize, and the Caribbean Sea; and on the east by the Gulf of...

 down to southern Brazil
Brazil
Brazil , officially the Federative Republic of Brazil , is the largest country in South America. It is the world's fifth largest country, both by geographical area and by population with over 192 million people...

. Other subspecies are all-year residents on Caribbean islands. As in most raptors, females are slightly larger than males. Broad-winged Hawks' wings are relatively short and broad with a tapered, somewhat pointed appearance. There are two types of colouration: a dark morph with fewer white areas and a light morph that is more pale overall. Although the Broad-winged Hawk's numbers are relatively stable, populations are declining in some parts of its breeding range because of forest fragmentation.

Description

The Broad-winged Hawk is a relatively small bird, with a body size from 34 to 44 cm (13.4 to 17.3 in) in length and weighing anywhere from 265 to 560 g (9.3 to 19.8 ). As in most raptors, females are slightly larger than males. Broad-winged Hawks have relatively short and broad wings, pointed at the end, which have a tapered appearance unique to the species. The Broad-winged Hawk can grow a wingspan of 81 to 100 cm (31.9 to 39.4 in). Adults' bodies are a dark brown with a white belly and chest containing horizontal barring. While their tail can be a dark grey-black with white lines along the middle, base and tip. The young hawks have a slightly different colouring with more white and longitudinal barring instead of horizontal barring. There are two types of colouration: a dark morph with fewer white areas and a light morph that is more pale overall. The light morph of this bird is most likely to be confused with the Red-shouldered Hawk
Red-shouldered Hawk
The Red-shouldered Hawk is a medium-sized hawk. Its breeding range spans eastern North America and along the coast of California and northern to northeastern-central Mexico.-Description:...

, but they have a longer, more heavily barred tail and wings with a solid rufous color in the adult which are usually distinctive. Rare dark morphs are a darker brown on both upperparts and underparts. Dark-morph Short-tailed Hawk
Short-tailed Hawk
The Short-tailed Hawk is an American bird of prey in the family Accipitridae, which also includes the eagles and Old World vultures. As a member of the genus Buteo, it is not a true hawk and thus also referred to as a "buteo" or "buzzard". The White-throated Hawk The Short-tailed Hawk (Buteo...

s are similar but are whitish under the tail with a single subterminal band.

Taxonomy

This species, Buteo platypterus, is in the family
Family (biology)
In biological classification, family is* a taxonomic rank. Other well-known ranks are life, domain, kingdom, phylum, class, order, genus, and species, with family fitting between order and genus. As for the other well-known ranks, there is the option of an immediately lower rank, indicated by the...

 Accipitridae
Accipitridae
The Accipitridae, one of the two major families within the order Accipitriformes , are a family of small to large birds with strongly hooked bills and variable morphology based on diet. They feed on a range of prey items from insects to medium-sized mammals, with a number feeding on carrion and a...

, which is placed in the order Falconiformes
Falconiformes
The order Falconiformes is a group of about 290 species of birds that comprises the diurnal birds of prey. Raptor classification is difficult and the order is treated in several ways.- Classification problems :...

 (or Accipitriformes
Accipitriformes
The Accipitriformes is an order that has been proposed to include most of the diurnal birds of prey: hawks, eagles, vultures, and many others, about 225 species in all. For a long time, the majority view has been to include them with the falcons in the Falconiformes, but some authorities have...

). Currently the species
Species
In biology, a species is one of the basic units of biological classification and a taxonomic rank. A species is often defined as a group of organisms capable of interbreeding and producing fertile offspring. While in many cases this definition is adequate, more precise or differing measures are...

 is split up into six subspecies
Subspecies
Subspecies in biological classification, is either a taxonomic rank subordinate to species, ora taxonomic unit in that rank . A subspecies cannot be recognized in isolation: a species will either be recognized as having no subspecies at all or two or more, never just one...

; each is named for its distribution, as listed below:
  • Buteo platypterus platypterus – Northern Broad-winged Hawk that occurs throughout much of continental eastern North America.
  • Buteo platypterus brunnescens – Puerto Rican Broad-winged Hawk that occurs in Puerto Rico
    Puerto Rico
    Puerto Rico , officially the Commonwealth of Puerto Rico , is an unincorporated territory of the United States, located in the northeastern Caribbean, east of the Dominican Republic and west of both the United States Virgin Islands and the British Virgin Islands.Puerto Rico comprises an...

    .
  • Buteo platypterus cubanensis – Cuban Broad-winged Hawk that occurs in Cuba
    Cuba
    The Republic of Cuba is an island nation in the Caribbean. The nation of Cuba consists of the main island of Cuba, the Isla de la Juventud, and several archipelagos. Havana is the largest city in Cuba and the country's capital. Santiago de Cuba is the second largest city...

    .
  • Buteo platypterus insulicola – Antigua Broad-winged Hawk that occurs in Antigua
    Antigua
    Antigua , also known as Waladli, is an island in the West Indies, in the Leeward Islands in the Caribbean region, the main island of the country of Antigua and Barbuda. Antigua means "ancient" in Spanish and was named by Christopher Columbus after an icon in Seville Cathedral, Santa Maria de la...

    .
  • Buteo platypterus rivierei – Dominican Broad-winged Hawk that occurs in Dominica
    Dominica
    Dominica , officially the Commonwealth of Dominica, is an island nation in the Lesser Antilles region of the Caribbean Sea, south-southeast of Guadeloupe and northwest of Martinique. Its size is and the highest point in the country is Morne Diablotins, which has an elevation of . The Commonwealth...

    , Martinique
    Martinique
    Martinique is an island in the eastern Caribbean Sea, with a land area of . Like Guadeloupe, it is an overseas region of France, consisting of a single overseas department. To the northwest lies Dominica, to the south St Lucia, and to the southeast Barbados...

     and St. Lucia.
  • Buteo platypterus antillarum – Antillean Broad-winged Hawk that occurs in the Lesser Antilles
    Lesser Antilles
    The Lesser Antilles are a long, partly volcanic island arc in the Western Hemisphere. Most of its islands form the eastern boundary of the Caribbean Sea with the Atlantic Ocean, with the remainder located in the southern Caribbean just north of South America...

     from Saint Vincent
    Saint Vincent (island)
    Saint Vincent is a volcanic island in the Caribbean. It is the largest island of the chain called Saint Vincent and the Grenadines. It is located in the Caribbean Sea, between Saint Lucia and Grenada. It is composed of partially submerged volcanic mountains...

     and Grenada
    Grenada
    Grenada is an island country and Commonwealth Realm consisting of the island of Grenada and six smaller islands at the southern end of the Grenadines in the southeastern Caribbean Sea...

     to Tobago
    Tobago
    Tobago is the smaller of the two main islands that make up the Republic of Trinidad and Tobago. It is located in the southern Caribbean, northeast of the island of Trinidad and southeast of Grenada. The island lies outside the hurricane belt...

    , excluding Antigua
    Antigua
    Antigua , also known as Waladli, is an island in the West Indies, in the Leeward Islands in the Caribbean region, the main island of the country of Antigua and Barbuda. Antigua means "ancient" in Spanish and was named by Christopher Columbus after an icon in Seville Cathedral, Santa Maria de la...

    .

Habitat and distribution

Broad-winged Hawks have a wide range in North America
North America
North America is a continent wholly within the Northern Hemisphere and almost wholly within the Western Hemisphere. It is also considered a northern subcontinent of the Americas...

 and South America
South America
South America is a continent situated in the Western Hemisphere, mostly in the Southern Hemisphere, with a relatively small portion in the Northern Hemisphere. The continent is also considered a subcontinent of the Americas. It is bordered on the west by the Pacific Ocean and on the north and east...

, from southern Canada
Canada
Canada is a North American country consisting of ten provinces and three territories. Located in the northern part of the continent, it extends from the Atlantic Ocean in the east to the Pacific Ocean in the west, and northward into the Arctic Ocean...

 to southern Brazil
Brazil
Brazil , officially the Federative Republic of Brazil , is the largest country in South America. It is the world's fifth largest country, both by geographical area and by population with over 192 million people...

. Their breeding range is in the northern and eastern parts of North America and some, not all, migrate
Bird migration
Bird migration is the regular seasonal journey undertaken by many species of birds. Bird movements include those made in response to changes in food availability, habitat or weather. Sometimes, journeys are not termed "true migration" because they are irregular or in only one direction...

 in the winter to Florida
Florida
Florida is a state in the southeastern United States, located on the nation's Atlantic and Gulf coasts. It is bordered to the west by the Gulf of Mexico, to the north by Alabama and Georgia and to the east by the Atlantic Ocean. With a population of 18,801,310 as measured by the 2010 census, it...

, southern Mexico
Mexico
The United Mexican States , commonly known as Mexico , is a federal constitutional republic in North America. It is bordered on the north by the United States; on the south and west by the Pacific Ocean; on the southeast by Guatemala, Belize, and the Caribbean Sea; and on the east by the Gulf of...

 and northern South America. There are five subspecies
Subspecies
Subspecies in biological classification, is either a taxonomic rank subordinate to species, ora taxonomic unit in that rank . A subspecies cannot be recognized in isolation: a species will either be recognized as having no subspecies at all or two or more, never just one...

 that are endemic to the Caribbean
Caribbean
The Caribbean is a crescent-shaped group of islands more than 2,000 miles long separating the Gulf of Mexico and the Caribbean Sea, to the west and south, from the Atlantic Ocean, to the east and north...

 that do not migrate
Bird migration
Bird migration is the regular seasonal journey undertaken by many species of birds. Bird movements include those made in response to changes in food availability, habitat or weather. Sometimes, journeys are not termed "true migration" because they are irregular or in only one direction...

. Thus, Broad-winged Hawks are partial migrants. Those subspecies
Subspecies
Subspecies in biological classification, is either a taxonomic rank subordinate to species, ora taxonomic unit in that rank . A subspecies cannot be recognized in isolation: a species will either be recognized as having no subspecies at all or two or more, never just one...

 that do migrate will fly in flocks of more then forty up to hundreds of thousands at heights anywhere from 550 metres (1,804.5 ft) to approximately 1300 metres (4,265.1 ft). They soar
Lift (soaring)
Gliding flight is heavier-than-air flight without the use of thrust. It is employed by gliding animals and by aircraft such as gliders. The most common human application of gliding flight is in sport and recreation using aircraft designed for this purpose...

 using thermals to carry them through their journey of 3000–6000 km (1,864.1–3,728.2 mi). Fall migration lasts for 70 days as birds migrate about 100 kilometres (62.1 mi) per day from North America, through Central America to South America without crossing salt water. The enormous flocks of soaring Broad-winged Hawks are termed kettles and are characteristic of many hawk migration spectacles in North America, such as at Hawk Cliff in Ontario
Ontario
Ontario is a province of Canada, located in east-central Canada. It is Canada's most populous province and second largest in total area. It is home to the nation's most populous city, Toronto, and the nation's capital, Ottawa....

, Hawk Ridge in Minnesota
Minnesota
Minnesota is a U.S. state located in the Midwestern United States. The twelfth largest state of the U.S., it is the twenty-first most populous, with 5.3 million residents. Minnesota was carved out of the eastern half of the Minnesota Territory and admitted to the Union as the thirty-second state...

, Hawk Mountain
Hawk Mountain
Hawk Mountain is a mountain ridge, part of the Blue Mountain Ridge in the Appalachian Mountain chain, located in central-eastern Pennsylvania near Reading and Allentown. The area includes 13,000 acres of protected private and public land, including the 2,600 acre Hawk Mountain Sanctuary.The River...

 in Pennsylvania, and the River of Raptors in Veracruz
Veracruz
Veracruz, formally Veracruz de Ignacio de la Llave officially Estado Libre y Soberano de Veracruz de Ignacio de la Llave , is one of the 31 states that, along with the Federal District, comprise the 32 federative entities of Mexico. It is divided in 212 municipalities and its capital city is...

.

Broad-winged Hawks stay in areas up to an elevation of about 2000 metres (6,561.7 ft). They breed in deciduous
Deciduous
Deciduous means "falling off at maturity" or "tending to fall off", and is typically used in reference to trees or shrubs that lose their leaves seasonally, and to the shedding of other plant structures such as petals after flowering or fruit when ripe...

 forests good for nesting and forage primarily in wetlands and meadows. While some birds have acclimatized themselves to living near humans even those birds avoid human settlements and interactions. In the winter the migrating
Bird migration
Bird migration is the regular seasonal journey undertaken by many species of birds. Bird movements include those made in response to changes in food availability, habitat or weather. Sometimes, journeys are not termed "true migration" because they are irregular or in only one direction...

 subspecies
Subspecies
Subspecies in biological classification, is either a taxonomic rank subordinate to species, ora taxonomic unit in that rank . A subspecies cannot be recognized in isolation: a species will either be recognized as having no subspecies at all or two or more, never just one...

 of the hawks seek out similar conditions to their overwintering home, so they settle in deciduous
Deciduous
Deciduous means "falling off at maturity" or "tending to fall off", and is typically used in reference to trees or shrubs that lose their leaves seasonally, and to the shedding of other plant structures such as petals after flowering or fruit when ripe...

 and mixed forests.

Although the Broad-winged Hawk's numbers are relatively stable, populations are declining in some parts of its breeding range because of forest fragmentation. Since there are no threats to its survival, it is assessed as Least Concern
Least Concern
Least Concern is an IUCN category assigned to extant taxon or lower taxa which have been evaluated but do not qualify for any other category. As such they do not qualify as threatened, Near Threatened, or Conservation Dependent...

 on the IUCN Red List
IUCN Red List
The IUCN Red List of Threatened Species , founded in 1963, is the world's most comprehensive inventory of the global conservation status of biological species. The International Union for Conservation of Nature is the world's main authority on the conservation status of species...

.

Vocalization

These hawks use vocalizations for communication with their mates and offspring. Also in territorial
Territory (animal)
In ethology the term territory refers to any sociographical area that an animal of a particular species consistently defends against conspecifics...

 displays towards intruders like the Red-tailed Hawk
Red-tailed Hawk
The Red-tailed Hawk is a bird of prey, one of three species colloquially known in the United States as the "chickenhawk," though it rarely preys on standard sized chickens. It breeds throughout most of North America, from western Alaska and northern Canada to as far south as Panama and the West...

s or other threatening animals. The call sounds like a very high pitched kee-ee, almost like a whistle. When confronted with a threat Broad-winged Hawks will emit an alarm call consisting of stuttered and squealing whistles.

Diet

Broad-winged Hawks are carnivores. The types of food they eat depends on the time of year. During the summer or nesting season the parents and ultimately their chicks will eat small mammals, such as chipmunks, shrews, and voles, frogs, lizards, and sometimes even other nesting birds. In the winter months Broad-winged Hawks have been observed feeding on insects, frogs, snakes, crab
Crab
True crabs are decapod crustaceans of the infraorder Brachyura, which typically have a very short projecting "tail" , or where the reduced abdomen is entirely hidden under the thorax...

s, and some small mammals. To catch their prey Broad-winged Hawks will watch from low branches hiding in the foliage until a target is spotted. From their roost they will do a short fast glide to capture the prey. They give special attention to preparing their food for consumption, skinning
Skinning
Skinning, a gerund from the verb to skin, commonly refers to the act of skin removal.The process is usually done with animals, mainly as preparation of the meat beneath and/or use for the fur...

 frogs and snakes and plucking prey birds' feathers. Most small mammals on the other hand will be eaten whole. They rarely drink water and are able to survive solely with the water present in their prey.

Reproduction

These birds will have only one mate during the breeding season, possibly because the male also helps a small amount with the upbringing of the chicks. They will breed anywhere between April and August starting when they are two years old; completely sexually developed. To attract and court females the males will do a flight display
Courtship display
Courtship display is a special, sometimes ritualised, set of behaviours which some animals perform as part of courtship. Courtship behaviours can include special calls, postures, and movements, and may involve special plumage, bright colours or other ornamentation. A good example is the 'dancing'...

 including cartwheels, birds meet in air hooking together by their talons and spiraling down together, dives, and other aerial acrobatics. They will also compete and fight with other males for the chance to mate with a female. If one of the males is successful the mating pair will have only one brood per season consisting of one to four eggs. Both the male and female will build the nest out of sticks and twigs in a deciduous
Deciduous
Deciduous means "falling off at maturity" or "tending to fall off", and is typically used in reference to trees or shrubs that lose their leaves seasonally, and to the shedding of other plant structures such as petals after flowering or fruit when ripe...

 tree before the eggs are to be laid. Once they are though the brown-spotted eggs are usually 49 by 39 mm (1.9 by 1.5 in) and weigh about 42 grams (1.5 oz). The female will then develop a brood patch
Brood patch
thumb|250px|Brood patch of [[Sand Martin]]A brood patch is a patch of featherless skin that is visible on the underside of birds during the nesting season. This patch of skin is well supplied with blood vessels at the surface making it possible for the birds to transfer heat to their eggs when...

 and incubate
Avian incubation
Incubation refers to the process by which certain oviparous animals hatch their eggs, and to the development of the embryo within the egg. The most vital factor of incubation is the constant temperature required for its development over a specific period. Especially in domestic fowl, the act of...

 the eggs for 28 days or longer before they hatch. The hatchlings will appear semi-altricial
Altricial
Altricial, meaning "requiring nourishment", refers to a pattern of growth and development in organisms which are incapable of moving around on their own soon after hatching or being born...

; incapable of any complex coordination but have open eyes and are covered in down feathers
Down feathers
The down of birds is a layer of fine feathers found under the tougher exterior feathers. Very young birds are clad only in down. Powder down is a specialized type of down found only in a few groups of birds. Down is a fine thermal insulator and padding, used in goods such as jackets, bedding,...

. Chicks will have rapid body growth until they are almost at adult body size at which time they are capable of walking, flying and eating without parental help. While in the nest the female gives most of the parental care, protecting and taking care of the chicks. It is not unusual to have the male provide some food for the female and offspring but his visits are short lived. Once a prey item is obtained for the nest the female will tear off pieces and will feed the chicks till they are able to rip meat off on their own. Often the chicks will fight for possession of the offered morsel, the younger ones usually losing and not getting enough. Broad-winged Hawks will protect their nests in a show of aggression (i.e. diving and chasing) towards any suspected threat but they generally will not make physical contact. Predators of eggs and nestlings includes raccoons, crows, porcupines and American Black Bear
American black bear
The American black bear is a medium-sized bear native to North America. It is the continent's smallest and most common bear species. Black bears are omnivores, with their diets varying greatly depending on season and location. They typically live in largely forested areas, but do leave forests in...

s and adults have been know to fall to Great Horned Owl
Great Horned Owl
The Great Horned Owl, , also known as the Tiger Owl, is a large owl native to the Americas. It is an adaptable bird with a vast range and is the most widely distributed true owl in the Americas.-Description:...

s and Bald Eagles. It will take the hatchlings five to six weeks before they are able to leave the nest. Some young even after that time will remain in the area of the nest for several weeks more.

External links

  • Broad-winged Hawk – Smithsonian Migratory Bird Center
  • Broad-winged Hawk media on the Internet Bird Collection
  • Broad Winged Hawk Photos by Julie Waters
  • Broad-winged Hawk photo gallery VIREO
  • Stamps (for Antigua
    Antigua
    Antigua , also known as Waladli, is an island in the West Indies, in the Leeward Islands in the Caribbean region, the main island of the country of Antigua and Barbuda. Antigua means "ancient" in Spanish and was named by Christopher Columbus after an icon in Seville Cathedral, Santa Maria de la...

    , Colombia
    Colombia
    Colombia, officially the Republic of Colombia , is a unitary constitutional republic comprising thirty-two departments. The country is located in northwestern South America, bordered to the east by Venezuela and Brazil; to the south by Ecuador and Peru; to the north by the Caribbean Sea; to the...

    , Dominica
    Dominica
    Dominica , officially the Commonwealth of Dominica, is an island nation in the Lesser Antilles region of the Caribbean Sea, south-southeast of Guadeloupe and northwest of Martinique. Its size is and the highest point in the country is Morne Diablotins, which has an elevation of . The Commonwealth...

    , Grenada
    Grenada
    Grenada is an island country and Commonwealth Realm consisting of the island of Grenada and six smaller islands at the southern end of the Grenadines in the southeastern Caribbean Sea...

    , Saint Vincent and the Grenadines
    Saint Vincent and the Grenadines
    Saint Vincent and the Grenadines is an island country in the Lesser Antilles chain, namely in the southern portion of the Windward Islands, which lie at the southern end of the eastern border of the Caribbean Sea where the latter meets the Atlantic Ocean....

    , Nevis
    Nevis
    Nevis is an island in the Caribbean Sea, located near the northern end of the Lesser Antilles archipelago, about 350 km east-southeast of Puerto Rico and 80 km west of Antigua. The 93 km² island is part of the inner arc of the Leeward Islands chain of the West Indies...

    , and Saint Vincent and the Grenadines
    Saint Vincent and the Grenadines
    Saint Vincent and the Grenadines is an island country in the Lesser Antilles chain, namely in the southern portion of the Windward Islands, which lie at the southern end of the eastern border of the Caribbean Sea where the latter meets the Atlantic Ocean....

    )
  • http://www.youtube.com/watch?v=y8_coNuiP3Y – Broad-winged hawk
  • http://www.youtube.com/watch?NR=1&v=GiVOyAoWqVA – Broad-winged hawk dive
  • http://www.youtube.com/watch?v=9EL1MIsBHNM – Broad-winged hawk devouring squirrel
  • http://www.xeno-canto.org/browse.php?query=broad-winged+hawk – call
  • http://www.picsearch.com/pictures/Animals/Birds/Birds%20Bl-Br/Broad-winged%20Hawk.html – Pictures
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