sooty shearwater
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The sooty shearwater (''Ardenna grisea'') is a medium-large
shearwater Shearwaters are medium-sized long-winged seabirds in the petrel family Procellariidae. They have a global marine distribution, but are most common in temperate and cold waters, and are pelagic outside the breeding season. Description These tub ...
in the
seabird Seabirds (also known as marine birds) are birds that are adapted to life within the marine environment. While seabirds vary greatly in lifestyle, behaviour and physiology, they often exhibit striking convergent evolution, as the same enviro ...
family
Procellariidae The family Procellariidae is a group of seabirds that comprises the fulmarine petrels, the gadfly petrels, the diving petrels, the prions, and the shearwaters. This family is part of the bird order Procellariiformes (or tubenoses), which als ...
. In New Zealand, it is also known by its
Māori Māori or Maori can refer to: Relating to the Māori people * Māori people of New Zealand, or members of that group * Māori language, the language of the Māori people of New Zealand * Māori culture * Cook Islanders, the Māori people of the C ...
name , and as muttonbird, like its relatives the
wedge-tailed shearwater The wedge-tailed shearwater (''Ardenna pacifica'') is a medium-large shearwater in the seabird family Procellariidae. It is one of the shearwater species that is sometimes referred to as a muttonbird, like the sooty shearwater of New Zealand and ...
(''A. pacificus'') and the
Australia Australia, officially the Commonwealth of Australia, is a Sovereign state, sovereign country comprising the mainland of the Australia (continent), Australian continent, the island of Tasmania, and numerous List of islands of Australia, sma ...
n
short-tailed shearwater The short-tailed shearwater or slender-billed shearwater (''Ardenna tenuirostris''; formerly ''Puffinus tenuirostris''), also called yolla or moonbird, and commonly known as the muttonbird in Australia, is the most abundant seabird species in A ...
(''A. tenuirostris'').


Taxonomy

The sooty shearwater was formally described in 1789 by the German naturalist
Johann Friedrich Gmelin , fields = , workplaces = University of GöttingenUniversity of Tübingen , alma_mater = University of Tübingen , doctoral_advisor = Philipp Friedrich GmelinFerdinand Christoph Oetinger , academic_advisors = , doctora ...
under the
binomial name In taxonomy, binomial nomenclature ("two-term naming system"), also called nomenclature ("two-name naming system") or binary nomenclature, is a formal system of naming species of living things by giving each a name composed of two parts, bot ...
''Procellaria grisea''. The shearwater had been briefly described in 1777 by James Cook in the account of his second voyage to the Pacific, and in 1785 the English ornithologist John Latham had described a museum specimen. The sooty shearwater is now placed in the
genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In the hierarchy of biological classification, genus com ...
''
Ardenna ''Ardenna'' is a genus of seabirds in the family Procellariidae. These medium-sized shearwater species were formerly included in the genus ''Puffinus''. Taxonomy A phylogenetic analysis using mitochondrial DNA published in 2004 found that ''Puff ...
'', that was introduced in 1853 by
Ludwig Reichenbach Heinrich Gottlieb Ludwig Reichenbach (8 January 1793 – 17 March 1879) was a German botanist and ornithologist. It was he who first requested Leopold Blaschka to make a set of glass marine invertebrate models for scientific education and museu ...
. The genus name ''Ardenna'' was used to refer to a seabird by Italian naturalist
Ulisse Aldrovandi Ulisse Aldrovandi (11 September 1522 – 4 May 1605) was an Italian naturalist, the moving force behind Bologna's botanical garden, one of the first in Europe. Carl Linnaeus and the comte de Buffon reckoned him the father of natural history st ...
in 1603, and the specific epithet ''grisea'' is medieval
Latin Latin (, or , ) is a classical language belonging to the Italic branch of the Indo-European languages. Latin was originally a dialect spoken in the lower Tiber area (then known as Latium) around present-day Rome, but through the power of the ...
for "grey". The species is considered to be
monotypic In biology, a monotypic taxon is a taxonomic group (taxon) that contains only one immediately subordinate taxon. A monotypic species is one that does not include subspecies or smaller, infraspecific taxa. In the case of genera, the term "unispec ...
; no
subspecies In biological classification, subspecies is a rank below species, used for populations that live in different areas and vary in size, shape, or other physical characteristics (morphology), but that can successfully interbreed. Not all species ...
are recognised. It appears to be particularly closely related to the
great shearwater The great shearwater (''Ardenna gravis'') is a large shearwater in the seabird family Procellariidae. It breeds colonially on rocky islands in the south Atlantic. Outside the breeding season it ranges widely in the Atlantic. Taxonomy The great s ...
(''A. gravis'') and the short-tailed shearwater, all blunt-tailed, black-billed species, but its precise relationships are obscure. In any case, these three species are among the larger species of shearwaters that have been moved into a separate genus ''Ardenna'' based on a phylogenetic analysis of
mitochondrial DNA Mitochondrial DNA (mtDNA or mDNA) is the DNA located in mitochondria, cellular organelles within eukaryotic cells that convert chemical energy from food into a form that cells can use, such as adenosine triphosphate (ATP). Mitochondrial D ...
.


Description

Sooty shearwaters are in length with a wingspan. It has the typical "shearing" flight of the genus, dipping from side to side on stiff wings with few wing beats, the wingtips almost touching the water. Its flight is powerful and direct, with wings held stiff and straight, giving the impression of a very small
albatross Albatrosses, of the biological family Diomedeidae, are large seabirds related to the procellariids, storm petrels, and diving petrels in the order Procellariiformes (the tubenoses). They range widely in the Southern Ocean and the North Pacifi ...
. This shearwater is identifiable by its dark
plumage Plumage ( "feather") is a layer of feathers that covers a bird and the pattern, colour, and arrangement of those feathers. The pattern and colours of plumage differ between species and subspecies and may vary with age classes. Within species, ...
, which is responsible for its name. In poor viewing conditions, it looks all black, but in good light, it shows as dark chocolate-brown with a silvery strip along the center of the underwing. Usually loud, sooty shearwaters coo and croak while on the breeding grounds. In the Atlantic, it is the only such bird, whereas in the Pacific part of its range, other all-dark large shearwaters are found. The short-tailed shearwater in particular is almost impossible to tell apart from the present species at a distance.


Distribution and habitat

Sooty shearwaters breed on small islands in the south
Pacific The Pacific Ocean is the largest and deepest of Earth's five oceanic divisions. It extends from the Arctic Ocean in the north to the Southern Ocean (or, depending on definition, to Antarctica) in the south, and is bounded by the continen ...
and south
Atlantic The Atlantic Ocean is the second-largest of the world's five oceans, with an area of about . It covers approximately 20% of Earth's surface and about 29% of its water surface area. It is known to separate the " Old World" of Africa, Europe an ...
Oceans, mainly around
New Zealand New Zealand ( mi, Aotearoa ) is an island country in the southwestern Pacific Ocean. It consists of two main landmasses—the North Island () and the South Island ()—and over 700 smaller islands. It is the sixth-largest island count ...
, the
Falkland Islands The Falkland Islands (; es, Islas Malvinas, link=no ) is an archipelago in the South Atlantic Ocean on the Patagonian Shelf. The principal islands are about east of South America's southern Patagonian coast and about from Cape Dubouzet ...
,
Tierra del Fuego Tierra del Fuego (, ; Spanish for "Land of the Fire", rarely also Fireland in English) is an archipelago off the southernmost tip of the South American mainland, across the Strait of Magellan. The archipelago consists of the main island, Isla ...
, and in the
Auckland Islands The Auckland Islands (Māori: ''Motu Maha'' "Many islands" or ''Maungahuka'' "Snowy mountains") are an archipelago of New Zealand, lying south of the South Island. The main Auckland Island, occupying , is surrounded by smaller Adams Islan ...
and Phillip Island off Norfolk Island. They start breeding in October, and incubate their young for about 54 days. Once the chick hatches, the parents raise their chick for 86 to 109 days. They are spectacular long-distance migrants, following a circular route, traveling north up the western side of the Pacific and Atlantic Oceans at the end of the nesting season in March–May, reaching subarctic waters in June–July, where they cross from west to east, then return south down the eastern side of the oceans in September–October, reaching to the breeding colonies in November. They do not migrate as a flock, but rather as individuals, associating only opportunistically; in June 1906, for example, two were shot near
Guadalupe Island Guadalupe Island ( es, Isla Guadalupe, link=no) is a volcanic island located off the western coast of Mexico's Baja California Peninsula and about southwest of the city of Ensenada in the state of Baja California, in the Pacific Ocean. The ...
off
Baja California Baja California (; 'Lower California'), officially the Free and Sovereign State of Baja California ( es, Estado Libre y Soberano de Baja California), is a state in Mexico. It is the northernmost and westernmost of the 32 federal entities of Mex ...
,
Mexico Mexico (Spanish: México), officially the United Mexican States, is a country in the southern portion of North America. It is bordered to the north by the United States; to the south and west by the Pacific Ocean; to the southeast by Guatema ...
, several weeks before the bulk of the population would pass by. Likewise, the identity of numerous large, dark shearwaters observed in October 2004 off
Kwajalein Kwajalein Atoll (; Marshallese: ) is part of the Republic of the Marshall Islands (RMI). The southernmost and largest island in the atoll is named Kwajalein Island, which its majority English-speaking residents (about 1,000 mostly U.S. civilia ...
in the Marshall Islands remain enigmatic; they might have been either sooty or short-tailed shearwaters, but neither species is generally held to pass through this region at that time. In the Atlantic Ocean, they cover distances in excess of from their breeding colony on the Falkland Islands (52°S 60°W) north to 60 to 70°N in the North Atlantic Ocean off north
Norway Norway, officially the Kingdom of Norway, is a Nordic country in Northern Europe, the mainland territory of which comprises the western and northernmost portion of the Scandinavian Peninsula. The remote Arctic island of Jan Mayen and t ...
; distances covered in the Pacific are similar or larger; although the Pacific Ocean colonies are not quite so far south, at 35 to 50°S off New Zealand, and moving north to the
Aleutian Islands The Aleutian Islands (; ; ale, Unangam Tanangin,”Land of the Aleuts", possibly from Chukchi language, Chukchi ''aliat'', "island"), also called the Aleut Islands or Aleutic Islands and known before 1867 as the Catherine Archipelago, are a cha ...
, the longitudinal width of the ocean makes longer migrations necessary. Recent tagging experiments have shown that birds breeding in New Zealand may travel 74,000 km in a year, reaching Japan, Alaska, and California, averaging more than 500 km per day. In
Great Britain Great Britain is an island in the North Atlantic Ocean off the northwest coast of continental Europe. With an area of , it is the largest of the British Isles, the largest European island and the ninth-largest island in the world. It is ...
, they move south in late August and September; with strong north and north-west winds, they may occasionally become "trapped" in the shallow, largely enclosed
North Sea The North Sea lies between Great Britain, Norway, Denmark, Germany, the Netherlands and Belgium. An epeiric sea on the European continental shelf, it connects to the Atlantic Ocean through the English Channel in the south and the Norwegian S ...
, and heavy passages may be seen flying back north up the British east coast as they retrace their path back to the Atlantic over northern
Scotland Scotland (, ) is a country that is part of the United Kingdom. Covering the northern third of the island of Great Britain, mainland Scotland has a border with England to the southeast and is otherwise surrounded by the Atlantic Ocean to the ...
.


Ecology and status

The sooty shearwater feeds on
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 li ...
and
squid True squid are molluscs with an elongated soft body, large eyes, eight arms, and two tentacles in the superorder Decapodiformes, though many other molluscs within the broader Neocoleoidea are also called squid despite not strictly fitting t ...
. They can dive up to 68 m deep for food, but more commonly take surface food, in particular often following
whale Whales are a widely distributed and diverse group of fully aquatic placental marine mammals. As an informal and colloquial grouping, they correspond to large members of the infraorder Cetacea, i.e. all cetaceans apart from dolphins and ...
s to catch fish disturbed by them. They also follow fishing boats to take fish scraps thrown overboard. Isotopic analyses revealed significant niche overlap between sooty shearwaters and great shearwaters. They breed in huge colonies and the female lays one white egg. These shearwaters nest in burrows lined with plant material, which are visited only at night to avoid predation by large
gull Gulls, or colloquially seagulls, are seabirds of the family Laridae in the suborder Lari. They are most closely related to the terns and skimmers and only distantly related to auks, and even more distantly to waders. Until the 21st century ...
s. The architecture of sooty shearwater burrows can vary within and between breeding colonies, and is influenced by competition for breeding space and habitat type, with soil under dense
tussac grass ''Poa flabellata'', commonly known as tussac grass or just tussac, is a tussock grass native to southern South America, the Falkland Islands, South Georgia and other islands in the South Atlantic. There are also two isolated records from the her ...
being easier to excavate than other substrates. In New Zealand, about 250,000 muttonbirds are harvested for oils and food each year by the indigenous Māori population. Young birds just about to fledge are collected from the burrows, plucked, and often preserved in salt. in 2022, climate change was thought to be impacting this cultural harvest by
Ngāi Tahu Ngāi Tahu, or Kāi Tahu, is the principal Māori (tribe) of the South Island. Its (tribal area) is the largest in New Zealand, and extends from the White Bluffs / Te Parinui o Whiti (southeast of Blenheim), Mount Mahanga and Kahurangi Poi ...
. Its numbers have been declining in recent decades, and it is presently classified as
near threatened A near-threatened species is a species which has been categorized as "Near Threatened" (NT) by the International Union for Conservation of Nature as that may be vulnerable to endangerment in the near future, but it does not currently qualify f ...
by the
IUCN The International Union for Conservation of Nature (IUCN; officially International Union for Conservation of Nature and Natural Resources) is an international organization working in the field of nature conservation and sustainable use of natu ...
. In 2009, the harvest reported record-low catches, on average a trapping cage yielded nearly 500 birds; in 2009, the number was estimated to be closer to 40 per cage.


Inspiration for Hitchcock's ''The Birds''

On August 18, 1961, the ''
Santa Cruz Sentinel The ''Santa Cruz Sentinel'' is a daily newspaper published in Santa Cruz, California, covering Santa Cruz County, California, and owned by Media News Group. Ottaway Community Newspapers, a division of Dow Jones & Company bought the paper in 1982 ...
'' reported that thousands of crazed sooty shearwaters were sighted on the shores of North
Monterey Bay Monterey Bay is a bay of the Pacific Ocean located on the coast of the U.S. state of California, south of the San Francisco Bay Area and its major city at the south of the bay, San Jose. San Francisco itself is further north along the coast, by ...
in California, regurgitating anchovies, flying into objects, and dying on the streets. The incident sparked the interest of local resident
Alfred Hitchcock Sir Alfred Joseph Hitchcock (13 August 1899 – 29 April 1980) was an English filmmaker. He is widely regarded as one of the most influential figures in the history of cinema. In a career spanning six decades, he directed over 50 featur ...
, along with a story about spooky bird behavior by British writer
Daphne du Maurier Dame Daphne du Maurier, Lady Browning, (; 13 May 1907 – 19 April 1989) was an English novelist, biographer and playwright. Her parents were actor-manager Sir Gerald du Maurier and his wife, actress Muriel Beaumont. Her grandfather was Geor ...
, helping to inspire Hitchcock's 1963 thriller '' The Birds'', a cautionary tale of nature revolting against man. The film is now ranked among the
American Film Institute The American Film Institute (AFI) is an American nonprofit film organization that educates filmmakers and honors the heritage of the motion picture arts in the United States. AFI is supported by private funding and public membership fees. Leade ...
's top-10 thrillers of the last century. Scientists looking at the stomach contents of turtles and seabirds gathered in 1961 Monterey Bay ship surveys have found toxin-making algae were present in 79% of the plankton the creatures ate. "I am pretty convinced that the birds were poisoned," says ocean environmentalist Sibel Bargu of Louisiana State University. "All the symptoms were extremely similar to later bird poisoning events in the same area." Plankton expert Raphael Kudela of USC points to leaky septic tanks installed amid a housing boom around Monterey Bay in the early 1960s as the ultimate culprit that may have fed the toxic algae: "It is to some extent a natural phenomenon, and the best thing we can do is monitor for the presence of toxins, and treat impacted wildlife."


References


Further reading

* Bull, John L.; Farrand, John Jr.; Rayfield, Susan &
National Audubon Society The National Audubon Society (Audubon; ) is an American non-profit environmental organization dedicated to conservation of birds and their habitats. Located in the United States and incorporated in 1905, Audubon is one of the oldest of such organ ...
(1977): ''The Audubon Society field guide to North American birds, Eastern Region''. Alfred A. Knopf, New York. * Harrison, Peter (1988): ''Seabirds'' (2nd ed.).
Christopher Helm Christopher Alexander Roger Helm (born Dundee, 1 February 1937 – 20 January 2007) was a Scottish book publisher, notably of ornithology related titles, including the '' Helm Identification Guides''. Born in Dundee, he was raised in Forfar ...
, London. * Gillson, Greg (2008): Field separation of Sooty and Short-tailed Shearwaters off the west coast of North America ''
Birding Birdwatching, or birding, is the observing of birds, either as a recreational activity or as a form of citizen science. A birdwatcher may observe by using their naked eye, by using a visual enhancement device like binoculars or a telescope, ...
'' 40(2): 34–40.


External links

* Sooty shearwater
Species text in The Atlas of Southern African Birds

Sooty shearwater photos


* The Titi Project
Website of a long-term sooty shearwater research project in New Zealand
Recovered 2006-NOV-20 *
NPR National Public Radio (NPR, stylized in all lowercase) is an American privately and state funded nonprofit media organization headquartered in Washington, D.C., with its NPR West headquarters in Culver City, California. It differs from other ...

"The Common Shearwater, Nature's Migration King"
''
Day to Day ''Day to Day'' (''D2D'') was a one-hour weekday American radio newsmagazine distributed by National Public Radio (NPR), and produced by NPR in collaboration with ''Slate''. Madeleine Brand, Alex Chadwick, and Alex Cohen served as hosts. Topics ...
'', aired August 8, 2006. Recovered 2006-NOV-20 * TerraNatur
"The incredible journey of sooty shearwater from New Zealand to the north Pacific for an endless summer"
25 April 2007
''Tītī – muttonbirding''
in Te Ara – the Encyclopedia of New Zealand
A Seaweed Pantry
– ''
Tales from Te Papa ''Tales From Te Papa'' is a television series of mini-documentaries about objects from the collection of the Museum of New Zealand Te Papa Tongarewa (Te Papa) and the activities of the Museum staff. The series is a partnership between Television N ...
'' episode 100 – a short video on muttonbirding {{Taxonbar, from=Q27074603
sooty shearwater The sooty shearwater (''Ardenna grisea'') is a medium-large shearwater in the seabird family Procellariidae. In New Zealand, it is also known by its Māori name , and as muttonbird, like its relatives the wedge-tailed shearwater (''A. pacificus ...
sooty shearwater The sooty shearwater (''Ardenna grisea'') is a medium-large shearwater in the seabird family Procellariidae. In New Zealand, it is also known by its Māori name , and as muttonbird, like its relatives the wedge-tailed shearwater (''A. pacificus ...
Subterranean nesting birds Cosmopolitan birds Birds of subantarctic islands Foveaux Strait
sooty shearwater The sooty shearwater (''Ardenna grisea'') is a medium-large shearwater in the seabird family Procellariidae. In New Zealand, it is also known by its Māori name , and as muttonbird, like its relatives the wedge-tailed shearwater (''A. pacificus ...
sooty shearwater The sooty shearwater (''Ardenna grisea'') is a medium-large shearwater in the seabird family Procellariidae. In New Zealand, it is also known by its Māori name , and as muttonbird, like its relatives the wedge-tailed shearwater (''A. pacificus ...