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Osprey

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"Fish hawk" redirects here. For other uses, see Fish Hawk (disambiguation) and Osprey (disambiguation).
"River hawk" redirects here. For sports teams using this name, see Riverhawks.

Osprey
Standing on its nest
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Accipitriformes
Family: Pandionidae
Genus: Pandion
Species:
P. haliaetus
Binomial name
Pandion haliaetus
Global range of Pandion haliaetus
Synonyms

Falco haliaetus Linnaeus, 1758

The osprey (/ˈɒspri, -preɪ/;[2] Pandion haliaetus), historically known as 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 60 cm (24 in) in length and 180 cm (71 in) across the wings. It is brown on the upperparts and predominantly greyish on the head and underparts.

The osprey tolerates a wide variety of habitats, nesting in any location near a body of water providing an adequate food supply. It is found on all continents except Antarctica, although in South America it occurs only as a non-breeding migrant.

As its other common names suggest, the osprey's diet consists almost exclusively of fish. It possesses specialised physical characteristics and unique behaviour in hunting its prey. Because of its unique characteristics it is classified in its own taxonomic genus, Pandion, and family, Pandionidae.

Taxonomy

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American osprey
Australasian osprey

The osprey was described in 1758 by the Swedish naturalist Carl Linnaeus under the name Falco haliaetus in his landmark tenth edition of his Systema Naturae.[3][4] Linnaeus specified the type locality as Europe, but in 1761 he restricted the locality to Sweden.[4][5] The osprey is the only species placed in the genus Pandion that was introduced by the French zoologist Marie Jules César Savigny in 1809.[6][7] The genus is the sole member of the family Pandionidae.[7] The species has always presented a riddle to taxonomists, but here it is treated as the sole living member of the family Pandionidae, and the family listed in its traditional place as part of the order Accipitriformes. Other schemes place it alongside the hawks and eagles in the family Accipitridae.[4] The Sibley-Ahlquist taxonomy has placed it together with the other diurnal raptors in a greatly enlarged Ciconiiformes, but this results in an unnatural paraphyletic classification.[8] Molecular phylogenetic analysis has found that the family Pandionidae is sister to the family Accipitridae. It is estimated that the two families diverged around 50.8 million years ago.[9]

The osprey is unusual in that it is a sole living species that occurs nearly worldwide. Even the few subspecies are not unequivocally separable. There are four generally recognised subspecies, although differences are small, and ITIS lists only the first three.[10]

Fossil record

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Two extinct species were named from the fossil record.[16] Pandion homalopteron described by Stuart L. Warter in 1976 was found in marine Middle Miocene deposits of the Barstovian age in the southern part of California. The second species Pandion lovensis was described by Jonathan J. Becker in 1985 and found in Florida; it dates to the Late Clarendonian and possibly represents a separate lineage from that of P. homalopteron and P. haliaetus. A number of claw fossils have been recovered from Pliocene and Pleistocene sediments in Florida and South Carolina.[citation needed]

The oldest recognized family Pandionidae fossils were recovered from the Oligocene age Jebel Qatrani Formation in Faiyum Governorate, Egypt. However, they are not complete enough to assign to a specific genus.[17] Another Pandionidae claw fossil was recovered from Early Oligocene deposits in the Mainz basin, Germany, and was described in 2006 by Gerald Mayr.[18]

Etymology

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The genus name Pandion derives from Pandíōn Πανδίων, the mythical Greek king of Athens and grandfather of Theseus, Pandion II. The species name haliaetus (Latin: haliaeetus)[19] comes from Greek ἁλιάετος haliáetos "sea-eagle" (also ἁλιαίετος haliaietos) from the combining form ἁλι- hali- of ἅλς hals "sea" and ἀετός aetos, "eagle".[20][21]

The origins of osprey are obscure;[22] the word itself was first recorded around 1460, derived via the Anglo-French ospriet and the Medieval Latin avis prede "bird of prey," from the Latin avis praedae though the Oxford English Dictionary notes a connection with the Latin ossifraga or "bone breaker" of Pliny the Elder.[23][24] However, this term referred to the bearded vulture.[25]

Description

[edit]
Osprey at Cootes Paradise, Hamilton, Ontario
Osprey call
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The osprey differs in several respects from other diurnal birds of prey. Its toes are of equal length, its tarsi are reticulate, and its talons are rounded, rather than grooved. The osprey and owls are the only raptors whose outer toe is reversible, allowing them to grasp their prey with two toes in front and two behind. This is particularly helpful when they grab slippery fish.[26] The osprey is 0.9–2.1 kg (2.0–4.6 lb) in weight and 50–66 cm (20–26 in) in length with a 127–180 cm (50–71 in) wingspan. It is, thus, of similar size to the largest members of the Buteo or Falco genera. The subspecies are fairly close in size, with the nominate subspecies averaging 1.53 kg (3.4 lb), P. h. carolinensis averaging 1.7 kg (3.7 lb) and P. h. cristatus averaging 1.25 kg (2.8 lb). The wing chord measures 38 to 52 cm (15 to 20 in), the tail measures 16.5 to 24 cm (6.5 to 9.4 in) and the tarsus is 5.2–6.6 cm (2.0–2.6 in).[27][28]

The upperparts are a deep, glossy brown, while the breast is white, sometimes streaked with brown, and the underparts are pure white. The head is white with a dark mask across the eyes, reaching to the sides of the neck.[29] The irises of the eyes are golden to brown, and the transparent nictitating membrane is pale blue. The bill is black, with a blue cere, and the feet are white with black talons.[26] On the underside of the wings the wrists are black, which serves as a field mark.[30] A short tail and long, narrow wings with four long, finger-like feathers, and a shorter fifth, give it a very distinctive appearance.[31]

In flight, Northern Territory, Australia

The sexes appear fairly similar, but the adult male can be distinguished from the female by its slimmer body and narrower wings. The breast band of the male is also weaker than that of the female or is non-existent, and the underwing coverts of the male are more uniformly pale. It is straightforward to determine the sex in a breeding pair, but harder with individual birds.[31]

The juvenile osprey may be identified by buff fringes to the plumage of the upperparts, a buff tone to the underparts, and streaked feathers on the head. During spring, barring on the underwings and flight feathers is a better indicator of a young bird, due to wear on the upperparts.[29]

In flight, the osprey has arched wings and drooping "hands", giving it a gull-like appearance. The call is a series of sharp whistles, described as cheep, cheep, or yewk, yewk. If disturbed by activity near the nest, the call is a frenzied cheereek![32]

Osprey callⓘ

Distribution and habitat

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See also: Ospreys in Britain
An osprey in Wisconsin, being pursued by a bald eagle attempting to steal a fish it caught

The osprey is the second most widely distributed raptor species, after the peregrine falcon, and is one of only six land-birds with a worldwide distribution.[33] It is found in temperate and tropical regions of all continents, except Antarctica. In North America it breeds from Alaska and Newfoundland south to the Gulf Coast and Florida, wintering further south from the southern United States through to Argentina.[34] It is found in summer throughout Europe north into Ireland, Scandinavia, Finland and Great Britain though not Iceland, and winters in North Africa.[35] In Australia it is mainly sedentary and found patchily around the coastline, though it is a non-breeding visitor to eastern Victoria and Tasmania.[36]

There is a 1,000 km (620 mi) gap, corresponding with the coast of the Nullarbor Plain, between its westernmost breeding site in South Australia and the nearest breeding sites to the west in Western Australia.[37] In the islands of the Pacific it is found in the Bismarck Islands, Solomon Islands and New Caledonia, and fossil remains of adults and juveniles have been found in Tonga, where it probably was wiped out by arriving humans.[38] It is possible it may once have ranged across Vanuatu and Fiji as well. It is an uncommon to fairly common winter visitor to all parts of South Asia,[39] and Southeast Asia from Myanmar through to Indochina and southern China, Indonesia, Malaysia, and the Philippines.[40]

Behaviour and ecology

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Diet

[edit]
Osprey with American gizzard shad
Osprey with scraps of fish on its beak

The osprey is piscivorous, with fish making up 99% of its diet.[41] It typically takes live fish weighing 150–300 g (5.3–10.6 oz) and about 25–35 cm (9.8–13.8 in) in length, but virtually any type of fish from 50 g (1.8 oz) to 2 kg (4.4 lb) can be taken.[27] Even larger 2.8 kg (6.2 lb) northern pike (Esox lucius) has been taken in Russia.[42] The species rarely scavenges dead or dying fish.[43]

Osprey feeding on a fish in Kartung, the Gambia. Characteristically its tongue often pokes out whilst swallowing food.

Ospreys have a vision that is well adapted to detecting underwater objects from the air. Prey is first sighted when the osprey is 10–40 m (33–131 ft) above the water, after which the bird hovers momentarily and then plunges feet first into the water.[44] They catch fish by diving into a body of water, oftentimes completely submerging their entire bodies. As an osprey dives it adjusts the angle of its flight to account for the distortion of the fish's image caused by refraction. Ospreys will typically eat on a nearby perch but have also been known to carry fish for longer distances.[45]

Occasionally, the osprey may prey on rodents, rabbits, hares, other mammals, snakes, turtles, frogs, birds, salamanders, conchs, and crustaceans.[43][46][47] Reports of ospreys feeding on carrion are rare. They have been observed eating dead white-tailed deer and Virginia opossums.[48]

Adaptations

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The osprey has several adaptations that suit its piscivorous lifestyle. These include reversible outer toes,[49] sharp spicules on the underside of the toes,[49] closable nostrils to keep out water during dives, backward-facing scales on the talons which act as barbs to help hold its catch and dense plumage which is oily and prevents its feathers from getting waterlogged.[50]

Reproduction

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Preparing to mate on the nest
Osprey standing next to its nest showing their relative sizes
Osprey chick (P h. carolinensis) in nest
Egg, collection of the Museum Wiesbaden

The osprey breeds near freshwater lakes and rivers, and sometimes on coastal brackish waters. Rocky outcrops just offshore are used in Rottnest Island off the coast of Western Australia, where there are 14 or so similar nesting sites of which five to seven are used in any one year. Many are renovated each season, and some have been used for 70 years. The nest is a large heap of sticks, driftwood, turf, or seaweed built in forks of trees, rocky outcrops, utility poles, artificial platforms, or offshore islets.[41][51] As wide as 2 meters and weighing about 135 kg (298 lb), large nests on utility poles may be fire hazards and have caused power outages.[52]

Generally, ospreys reach sexual maturity and begin breeding around the age of three to four, though in some regions with high osprey densities, such as Chesapeake Bay in the United States, they may not start breeding until five to seven years old, and there may be a shortage of suitable tall structures. If there are no nesting sites available, young ospreys may be forced to delay breeding. To ease this problem, posts are sometimes erected to provide more sites suitable for nest building.[53] The nesting platform design developed by the organization Citizens United to Protect the Maurice River and Its Tributaries, Inc. has become the official design of the State of New Jersey, U.S. The nesting platform plans and materials list, available online, have been utilized by people from a number of different geographical regions.[54] There is a global site for mapping osprey nest locations and logging observations on reproductive success.[55]

Ospreys usually mate for life. Rarely, polyandry has been recorded.[56] The breeding season varies according to latitude: spring (September–October) in southern Australia, April to July in northern Australia, and winter (June–August) in southern Queensland.[51] In spring, the pair begins a five-month period of partnership to raise their young. The female lays two to four eggs within a month and relies on the size of the nest to conserve heat. The eggs are whitish with bold splotches of reddish-brown and are about 6.2 cm × 4.5 cm (2.4 in × 1.8 in) and weigh about 65 g (2.3 oz).[51] The eggs are incubated for about 35–43 days to hatching.[57]

The newly hatched chicks weigh only 50–60 g (1.8–2.1 oz), but fledge in 8–10 weeks. A study on Kangaroo Island, South Australia, had an average time between hatching and fledging of 69 days. The same study found an average of 0.66 young fledged per year per occupied territory, and 0.92 young fledged per year per active nest. Some 22% of surviving young either remained on the island or returned at maturity to join the breeding population.[56] When food is scarce, the first chicks to hatch are most likely to survive. The typical lifespan is 7–10 years, though rarely individuals can grow to as old as 20–25 years.[citation needed] The oldest European wild osprey on record lived to be over thirty years of age.[citation needed]

Migration

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European breeders winter in Africa.[58] American and Canadian breeders winter in South America, although some stay in the southernmost U.S. states such as Florida and California.[59] Some ospreys from Florida migrate to South America.[60] Australasian ospreys tend not to migrate.

Studies of Swedish ospreys showed that females tend to migrate to Africa earlier than males. More stopovers are made during their autumn migration. The variation of timing and duration in autumn was more variable than in spring. Although migrating predominantly during the day, they sometimes fly in the dark hours, particularly in crossings over water and cover on average 260–280 km (160–170 mi) per day with a maximum of 431 km (268 mi) per day.[61] European birds may also winter in South Asia, as indicated by an osprey tagged in Norway being monitored in western India.[62] In the Mediterranean, ospreys show partial migratory behaviour with some individuals remaining resident, whilst others undertake relatively short migration trips.[63]

Mortality

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Swedish ospreys have a significantly higher mortality rate during migration seasons than during stationary periods, with more than half of the total annual mortality occurring during migration.[64] These deaths can also be categorized into spatial patterns: Spring mortality occurs mainly in Africa, which can be traced to crossing the Sahara desert. Mortality can also occur through mishaps with human utilities, such as nesting near overhead electric cables or collisions with aircraft.[65]

Conservation

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Adults on a man-made nest in New Jersey, US

The osprey has a large range, covering 9,670,000 km2 (3,730,000 sq mi) in just Africa and the Americas, and has a large global population estimated at 460,000 individuals. Although global population trends have not been quantified, the species is not believed to approach the thresholds for the population decline criterion of the IUCN Red List (i.e., declining more than 30% in ten years or three generations), and for these reasons, the species is evaluated as Least Concern.[1] There is evidence for regional decline in South Australia where former territories at locations in the Spencer Gulf and along the lower Murray River have been vacant for decades.[37]

In the late 19th and early 20th centuries, the main threats to osprey populations were egg collectors and hunting of the adults along with other birds of prey,[66][67] but osprey populations declined drastically in many areas in the 1950s and 1960s; this appeared to be in part due to the toxic effects of insecticides such as DDT on reproduction.[68] The pesticide interfered with the bird's calcium metabolism which resulted in thin-shelled, easily broken or infertile eggs.[34] Possibly because of the banning of DDT in many countries in the early 1970s, together with reduced persecution, the osprey, as well as other affected bird of prey species, have made significant recoveries.[41] In South Australia, nesting sites on the Eyre Peninsula and Kangaroo Island are vulnerable to unmanaged coastal recreation and encroaching urban development.[37]

Cultural depictions

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Literature

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  • The Roman writer Pliny the Elder reported that parent ospreys made their young fly up to the sun as a test, and dispatched any that failed.[69]
  • Another odd legend regarding this fish-eating bird of prey, derived from the writings of Albertus Magnus and recorded in Holinshed's Chronicles, was that it had one webbed foot and one taloned foot.[67][70]
  • The osprey is mentioned in the famous Chinese folk poem "guan guan ju jiu" (關關雎鳩); "ju jiu" 雎鳩 refers to the osprey, and "guan guan" (關關) to its voice. In the poem, the osprey is considered to be an icon of fidelity and harmony between wife and husband, due to its highly monogamous habits. Some commentators have claimed that "ju jiu" in the poem is not the osprey but the mallard duck, since the osprey cannot make the sound "guan guan".[71][72]
  • The Irish poet William Butler Yeats used a grey wandering osprey as a representation of sorrow in The Wanderings of Oisin and Other Poems (1889).[69]
  • There was a medieval belief that fish were so mesmerised by the osprey that they turned belly-up in surrender,[67] and this is referenced by Shakespeare in Act 4 Scene 5 of Coriolanus:

I think he'll be to Rome
As is the osprey to the fish, who takes it
By sovereignty of nature.

The osprey pictured in the coat of arms of Sääksmäki
Cap badge of the Selous Scouts was a stylized osprey

Iconography

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  • In heraldry, the osprey is typically depicted as a white eagle,[70] often maintaining a fish in its talons or beak, and termed a "sea-eagle". It is historically regarded as a symbol of vision and abundance; more recently it has become a symbol of positive responses to nature,[67] and has been featured on more than 50 international postage stamps.[73]
  • In 1994, the osprey was declared the provincial bird of Nova Scotia, Canada.[74]

Sports

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Some sports clubs are named after the osprey such as the University of North Florida's North Florida Ospreys and Missoula Osprey baseball team.[75]

"Seahawks", another term for osprey, is also common among sports teams. The Seattle Seahawks, a professional American football team in the National Football League, received their identity from a naming contest, defeating 1,740 others.[76] According to team general manager John Thompson, the name "shows aggressiveness, reflects our soaring Northwest heritage and belongs to no other major league team."[77]

Other

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So-called "osprey" plumes were an important item in the plume trade of the late 19th century and used in hats including those used as part of the army uniform. Despite their name, these plumes were actually obtained from egrets.[78]

During the 2017 regular session of the Oregon Legislature, there was a short-lived controversy over the western meadowlark's status as the state bird versus the osprey. The sometimes-spirited debate included state representative Rich Vial playing the meadowlark's song on his smartphone over the House microphone.[79] A compromise was reached in SCR 18,[80] which was passed on the last day of the session, designating the western meadowlark as the state songbird and the osprey as the state raptor.

References

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