The coypu (from Spanish coipú, from Mapudungun koypu; Myocastor coypus), also known as the nutria, is a large, herbivorous, semiaquatic rodent. Classified for a long time as the only member of the family Myocastoridae, Myocastor is actually nested within Echimyidae, the family of the spiny rats. The coypu lives in burrows alongside stretches of water, and feeds on river plant stems. Originally native to subtropical and temperate South America, it has since been introduced to North America, Europe, Asia, and Africa, primarily by fur farmers. Although it is still hunted and trapped for its fur in some regions, its destructive burrowing and feeding habits often bring it into conflict with humans, and it is considered an invasive species.
Temporal range: Late Pliocene–Recent
Fabre et al., 2017
|Coypu range; native in red, introduced in pink|
The genus name Myocastor derives from the two Ancient Greek words μῦς (mûs), meaning "rat, mouse", and κάστωρ (kástōr), meaning "beaver". Literally, therefore, the name Myocastor means "beaver rat".
Two names are commonly used in English for Myocastor coypus. The name "nutria" (from Spanish nutria) is generally used in North America, Asia, and throughout countries of the former Soviet Union; however, in most Spanish-speaking countries, the word "nutria" refers primarily to the otter. To avoid this ambiguity, the name "coypu" or "coipo" (derived from the Mapudungun language) is used in Latin America and parts of Europe. In France, the coypu is known as a ragondin. In Dutch, it is known as beverrat (beaver rat). In German, it is known as Nutria, Biberratte (beaver rat), or Sumpfbiber (swamp beaver). In Italy, instead, the popular name is, as in North America and Asia, "nutria", but it is also called castorino ("little beaver"), by which its fur is known in Italy. In Swedish, the animal is known as sumpbäver (marsh/swamp beaver). In Brazil, the animal is known as ratão-do-banhado, nútria, or caxingui (the last from the Tupi language).
The coypu was first described by Juan Ignacio Molina in 1782 as Mus coypus, a member of the mouse genus. The genus Myocastor was assigned in 1792 by Robert Kerr. Geoffroy Saint-Hilaire, independently of Kerr, named the species Myopotamus coypus, and it is occasionally referred to by this name.
Four subspecies are generally recognized:
M. c. bonariensis, the subspecies present in the northernmost (subtropical) part of the coypu's range, is believed to be the type of coypu most commonly introduced to other continents.
Comparison of DNA and protein sequences showed that the genus Myocastor is the sister group to the genus Callistomys (painted tree-rats). In turn, these two taxa share evolutionary affinities with other Myocastorini genera: Proechimys and Hoplomys (armored rats) on the one hand, and Thrichomys on the other hand.
|Genus-level cladogram of the Myocastorini.|
|The cladogram has been reconstructed from mitochondrial and nuclear DNA characters.|
The coypu somewhat resembles a very large rat, or a beaver with a small tail. Adults are typically 4–9 kg (8.8–19.8 lb) in weight, and 40–60 cm (16–24 in) in body length, with a 30 to 45 cm (12 to 18 in) tail. It is possible for coypu to weigh up to 16 to 17 kg (35 to 37 lb), although adults usually average 4.5 to 7 kg (9.9 to 15.4 lb). They have coarse, darkish brown outer fur with soft dense grey under fur, also called the nutria. Three distinguishing features are a white patch on the muzzle, webbed hind feet, and large, bright orange-yellow incisors. The nipples of female coypu are high on her flanks, to allow their young to feed while the female is in the water.
A coypu is often mistaken for a muskrat, another widely dispersed, semiaquatic rodent that occupies the same wetland habitats. The muskrat, however, is smaller and more tolerant of cold climates, and has a laterally flattened tail it uses to assist in swimming, whereas the tail of a coypu is round. It can also be mistaken for a small beaver, as beavers and coypus have very similar anatomies. However, beavers' tails are flat and paddle-like, as opposed to the round tails of coypus.
Coypus can live up to six years in captivity, but individuals uncommonly live past three years old; according to one study, 80% of coypus die within the first year, and less than 15% of a wild population is over three years old. Male coypus reach sexual maturity as early as four months, and females as early as three months; however, both can have a prolonged adolescence, up to the age of 9 months. Once a female is pregnant, gestation lasts 130 days, and she may give birth to as few as one or as many as 13 offspring. They generally line nursery nests with grasses and soft reeds. Baby coypus are precocial, born fully furred and with open eyes; they can eat vegetation with their parents within hours of birth. A female coypu can become pregnant again the day after she gives birth to her young. If timed properly, a female can become pregnant three times within a year. Newborn coypus nurse for seven to eight weeks, after which they leave their mothers.
Besides breeding quickly, each coypu consumes large amounts of vegetation. An individual consumes about 25% of its body weight daily, and feeds year-round. Being one of the world's larger extant rodents, a mature, healthy coypu averages 5.4 kg (12 lb) in weight, but they can reach as much as 10 kg (22 lb). They eat the base of the above-ground stems of plants, and often dig through the organic soil for roots and rhizomes to eat. Their creation of "eat-outs", areas where a majority of the above- and below-ground biomass has been removed, produces patches in the environment, which in turn disrupts the habitat for other animals and humans dependent on marshes.
Coypus are found most commonly in freshwater marshes, but also inhabit brackish marshes and rarely salt marshes. They either construct their own burrows, or occupy burrows abandoned by beaver, muskrats, or other animals. They are also capable of constructing floating rafts out of vegetation.
Local extinction in their native range due to overharvesting led to the development of coypu fur farms in the late 19th and early 20th centuries. The first farms were in Argentina and then later in Europe, North America, and Asia. These farms have generally not been successful long-term investments, and farmed coypu often are released or escape as operations become unprofitable. The first attempt at coypu farming was in France in the early 1880s, but it was not much of a success. The first efficient and extensive coypu farms were located in South America in the 1920s. The South American farms were very successful, and led to the growth of similar farms in North America and Europe. Coypus from these farms often escaped, or were deliberately released into the wild to provide a game animal or to remove aquatic vegetation.
Coypus were introduced to the Louisiana ecosystem in the 1930s, when they escaped from fur farms that had imported them from South America. Coypu were released into the wild by at least one Louisiana nutria farmer in 1933 and these releases were followed by E. A. McIlhenny who released his entire stock in 1945 on Avery Island. In 1940, some of the nutria escaped during a hurricane and quickly populated coastal marshes, inland swamps, and other wetland areas. From Louisiana, coypus have spread across the Southern United States, wreaking havoc on marshland.
Following a decline in demand for coypu fur, coypu have since become pests in many areas, destroying aquatic vegetation, marshes, and irrigation systems, and chewing through man-made items such as tires and wooden house panelling in Louisiana, eroding river banks, and displacing native animals. Damage in Louisiana has been sufficiently severe since the 1950s to warrant legislative attention; in 1958, the first bounty was placed on nutria, though this effort was not funded.:3 By the early 2000s, the Coastwide Nutria Control Program was established, which began paying bounties for nutria killed in 2002.:19–20 In the Chesapeake Bay region in Maryland, where they were introduced in the 1940s, coypus are believed to have destroyed 7,000 to 8,000 acres (2,800 to 3,200 ha) of marshland in the Blackwater National Wildlife Refuge. In response, by 2003, a multimillion-dollar eradication program was underway.
In the United Kingdom, coypus were introduced to East Anglia, for fur, in 1929; many escaped and damaged the drainage works, and a concerted programme by MAFF eradicated them by 1989. However, in 2012, a "giant rat" was killed in County Durham, with authorities suspecting the animal was, in fact, a coypu.
Marsh Dog, a US company based in Baton Rouge, Louisiana, received a grant from the Barataria-Terrebonne National Estuary Program to establish a company that uses nutria meat for dog food products. In 2012, the Louisiana Wildlife Federation recognized Marsh Dog with "Business Conservationist of the Year" award for finding a use for this ecosustainable protein.
In Kyrgyzstan and Uzbekistan, nutria (Russian and local languages Нутрия) are farmed on private plots and sold in local markets as a poor man's meat. As of 2016, however, the meat is used successfully in Moscow restaurant Krasnodar Bistro, as part of the growing Russian localvore movement and as a 'foodie' craze. It appears on the menu as a burger, hotdog, dumplings, or wrapped in cabbage leaves, with the flavour being somewhere between turkey and pork.
In addition to direct environmental damage, coypus are the host for a nematode parasite (Strongyloides myopotami) that can infect the skin of humans, causing dermatitis similar to strongyloidiasis. The condition is also called "nutria itch".
Native to subtropical and temperate South America, it has since been introduced to North America, Europe, Asia, and Africa, primarily by fur ranchers. The distribution of coypus outside South America tends to contract or expand with successive cold or mild winters. During cold winters, coypus often suffer frostbite on their tails, leading to infection or death. As a result, populations of coypus often contract and even become locally or regionally extinct as in the Scandinavian countries and such US states as Idaho, Montana, and Nebraska during the 1980s. During mild winters, their ranges tend to expand northward. For example, in recent years, range expansions have been noted in Washington and Oregon, as well as Delaware.
According to the U.S. Geological Survey, nutria were first introduced to the United States in California, in 1899. They were first brought to Louisiana in the early 1930s for the fur industry, and the population was kept in check, or at a small population size, because of trapping pressure from the fur traders. The earliest account of nutria spreading freely into Louisiana wetlands from their enclosures was in the early 1940s; a hurricane hit the Louisiana coast for which many people were unprepared, and the storm destroyed the enclosures, enabling the nutria to escape into the wild. According to the Louisiana Department of Wildlife and Fisheries, nutria were also transplanted from Port Arthur, Texas, to the Mississippi River in 1941 and then spread due to a hurricane later that year.
Wetlands in general are a valuable resource both economically and environmentally. For instance, the U.S. Fish and Wildlife Service determined wetlands covered only 5% of the land surface of the contiguous 48 United States, but they support 31% of the nation's plant species. These very biodiverse systems provide resources, shelter, nesting sites, and resting sites (particularly Louisiana's coastal wetlands such as Grand Isle for migratory birds) to a wide array of wildlife. Human users also receive many benefits from wetlands, such as cleaner water, storm surge protection, oil and gas resources (especially on the Gulf Coast), reduced flooding, and chemical and biological waste reduction, to name a few. In Louisiana, rapid wetland loss occurs due to a variety of reasons; this state loses an estimated area about the size of a football field every hour. The problem became so serious that Sheriff Harry Lee of Jefferson Parish used SWAT sharpshooters against the animals.
In 1998, the Louisiana Department of Wildlife and Fisheries (LDWF) conducted the first Louisiana coast-wide survey, which was funded by the Coastal Wetlands Planning, Protection, and Restoration Act and titled the Nutria Harvest and Wetland Demonstration Program, to evaluate the condition of the marshlands. The survey revealed through aerial surveys of transects that herbivory damage to wetlands totaled roughly 90,000 acres. The next year, LDWF performed the same survey and found the area damaged by herbivory increased to about 105,000 acres. The LDWF has determined the wetlands affected by nutria decreased from an estimated 80,000+ acres of Louisiana wetlands in 2002–2003 season to about 6,296 acres during the 2010–2011 season. The LDWF stresses that coastal wetland restoration projects will be greatly hindered without effective, sustainable nutria population control.
Nutria herbivory "severely reduces overall wetland biomass and can lead to the conversion of wetland to open water. " Unlike other common disturbances in marshlands, such as fire and tropical storms, which are a once- or few-times-a-year occurrence, nutria feed year round, so their effects on the marsh are constant. Also, nutria are typically more destructive in the winter than in the growing season, due largely to the scarcity of above-ground vegetation; as nutria search for food, they dig up root networks and rhizomes for food. While nutria are the most common herbivores in Louisiana marshes, they are not the only ones. Feral hogs, also known as wild boars (Sus scrofa), swamp rabbits (Sylvilagus aquaticus), and muskrats (Ondatra zibethicus) are less common, but feral hogs are increasing in number in Louisiana wetlands. On plots open to nutria herbivory, 40% less vegetation was found than in plots guarded against nutria by fences. This number may seem insignificant, and indeed herbivory alone is not a serious cause of land loss, but when herbivory was combined with an additional disturbance, such as fire, single vegetation removal, or double vegetation removal to simulate a tropical storm, the effect of the disturbances on the vegetation were greatly amplified. " Essentially, this means, as different factors were added together, the result was less overall vegetation. Adding fertilizer to open plots did not promote plant growth; instead, nutria fed more in the fertilized areas. Increasing fertilizer inputs in marshes only increases nutria biomass instead of the intended vegetation, therefore increasing nutrient input is not recommended.
In the UK, coypu escaped from fur farms and were reported in the wild as early as 1932. There were three unsuccessful attempts to control coypu in east Great Britain between 1943 and 1944. Coypu population and range increased causing damage to agriculture in the 1950s. During the 1960s, a grant was awarded to Rabbit Clearance Societies that included coypu. This control allowed for the removal of 97,000 coypu in 1961 and 1962. From 1962 to 1965, 12 trappers were hired to eradicate as many coypu as possible near Norfolk Broads. The campaign used live traps allowing non-target species to be released while any coypu caught were killed by gun. Combined with cold winters in 1962 to 1963, almost 40,500 coypu were removed from the population. Although coypu populations were greatly reduced after the 1962-1965 campaign ended, the population increased until another eradication campaign began in 1981. This campaign succeeded in fully eradicating coypu in Great Britain. The trapping areas were broken into 8 sectors leaving no area uncontrolled. The 24 Trappers were offered an incentive for early completion of the 10-year campaign. In 1989 coypu were assumed eradicated as only 3 males were found between 1987 and 1989.
A coypu was first sighted in the wild in Ireland in 2010.
Some coypu escaped from a pet farm in Cork City in 2015 and began breeding on the outskirts of the city. Ten were trapped on the Curraheen River in 2017 but the rodents continued to spread, reaching Dublin via the Royal Canal in 2019. Animals were found along the River Mulkear in 2015. The National Biodiversity Data Centre issued a species alert in 2017, saying that coypu "[have] the potential to be a high impact invasive species in Ireland. […] This species is listed as among 100 of the worst invasive species in Europe."
Nutria herbivory "is perhaps the least studied or quantified aspect of wetland loss". Many coastal restoration projects involve planting vegetation to stabilize marshland, but this requires proper nutria control to be successful.
The Coastwide Nutria Control Program, provides incentives for harvesting nutria. Starting in 2002, Louisiana Department of Wildlife and Fisheries (LDWF) has performed aerial surveys just as they had done for the Nutria Harvest and Wetland Demonstration Program, only it is now under a different program title. Under the Coastwide Nutria Control Program, which also receives funds from CWPPRA, 308,160 nutria were harvested the first year (2002–2003), revealing 82,080 acres damaged and totaling $1,232,640 in incentive payments paid out to those legally participating in the program. Essentially, once a person receives a license to hunt or trap nutria, then that person is able to capture an unlimited number. When a nutria is captured, the tail is cut off and turned in to a Coastal Environments Inc. official at an approved site. Each nutria tail is worth $5, which is an increase from $4 before the 2006–2007 season. Nutria harvesting increased drastically during the 2009–2010 year, with 445,963 nutria tails turned in worth $2,229,815 in incentive payments. Each CEI official keeps record of how many tails have been turned in by each individual per parish, the method used in capture of the nutria, and the location of capture. All of this information is transferred to a database to calculate the density of nutria across the Louisiana coast, and the LDWF combines these data with the results from the aerial surveys to determine the number of nutria remaining in the marshes and the amount of damage they are inflicting on the ecosystem.
Another program executed by LDWF involves creating a market of nutria meat for human consumption, though it is still trying to gain public notice. Nutria is a very lean, protein-rich meat, low in fat and cholesterol with the taste, texture, and appearance of rabbit or dark turkey meat. Few pathogens are associated with the meat, but proper heating when cooking should kill them. The quality of the meat and the minimal harmful microorganisms associated with it make nutria meat an "excellent food product for export markets".
Several desirable control methods are currently ineffective for various reasons. Zinc phosphide is the only rodenticide currently registered to control nutria, but it is expensive, remains toxic for months, detoxifies in high humidity and rain, and requires construction of (expensive) floating rafts for placement of the chemical. It is not yet sure how many nontarget species are susceptible to zinc phosphide, but birds and rabbits have been known to die from ingestion. Therefore, this chemical is rarely used, especially not in large-scale projects. Other potential chemical pesticides would be required by the US Environmental Protection Agency to undergo vigorous testing before they could be acceptable to use on nutria. The LDWF has estimated costs for new chemicals to be $300,000 for laboratory, chemistry, and field studies, and $500,000 for a mandatory Environmental Impact Statement. Contraception is not a common form of control, but is preferred by some wildlife managers. It also is expensive to operate - an estimated $6 million annually to drop bait laced with birth-control chemicals. Testing of other potential contraceptives would take about five to eight years and $10 million, with no guarantee of FDA approval. Also, an intensive environmental assessment would have to be completed to determine whether any nontarget organisms were affected by the contraceptive chemicals. Neither of these control methods is likely to be used in the near future.
An eradication program on the Delmarva Peninsula, between Chesapeake Bay and the Atlantic coast, where they once numbered in the tens of thousands and had destroyed thousands of acres of marshland, had nearly succeeded by 2012.
Nutria were found in Merced County in 2017 on the edge of the San Joaquin River Delta. State officials are concerned that they will harm infrastructure that sends water to San Joaquin Valley farms and urban areas.
It was a surprise, frankly," Steve Kendrot, a U.S. Department of Agriculture wildlife services program manager, said Wednesday. "We didn't expect to find anything that far up.
An alligator is a crocodilian in the genus Alligator of the family Alligatoridae. The two living species are the American alligator (A. mississippiensis) and the Chinese alligator (A. sinensis). Additionally, several extinct species of alligator are known from fossil remains. Alligators first appeared during the Oligocene epoch about 37 million years ago.The name "alligator" is probably an anglicized form of el lagarto, the Spanish term for "the lizard", which early Spanish explorers and settlers in Florida called the alligator. Later English spellings of the name included allagarta and alagarto.Bayou Segnette State Park
Bayou Segnette State Park is located in Westwego, Jefferson Parish, southwest of New Orleans, Louisiana, on the west bank of the Mississippi River.
Bayou Segnette is not far from the urban center of New Orleans, yet it features access to two types of wetlands, swamp and marsh. Saltwater intrusion coming into the canals from the Gulf of Mexico created the marsh. This is a remarkable habitat for plant and wildlife. This habitat is home to American alligators, coypu, nine-banded armadillos, Virginia opossum, raccoons, American mink, red-tailed hawks, kites, red-winged blackbirds, bald eagles, and northern cardinals.Capybara
The capybara (Hydrochoerus hydrochaeris) is a mammal native to South America. It is the largest living rodent in the world. Also called chigüire, chigüiro (in Colombia and Venezuela) and carpincho, it is a member of the genus Hydrochoerus, of which the only other extant member is the lesser capybara (Hydrochoerus isthmius). Its close relatives include guinea pigs and rock cavies, and it is more distantly related to the agouti, the chinchilla, and the coypu. The capybara inhabits savannas and dense forests and lives near bodies of water. It is a highly social species and can be found in groups as large as 100 individuals, but usually lives in groups of 10–20 individuals. The capybara is not a threatened species but it is hunted for its meat and hide and also for grease from its thick fatty skin, which is used in the pharmaceutical trade.Caviomorpha
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The fauna of the State of Louisiana is characterized by the region’s low swamplands, bayous, creeks, woodlands, coastal marshlands and beaches, and barrier islands covering an estimated 20,000 square miles (counting for 40 percent of Louisiana's total land area). Southern Louisiana contains up to fifty percent of the wetlands found in the Continental United States, and are made up of countless bayous and creeks.
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Some of the most common animals found throughout all of the parishes include otter, deer, mink, muskrat, raccoons, opossums, rabbits, squirrels, nutria, turtles, alligators, woodcocks, skunks, foxes, beavers, civet cats, armadillos, coyotes and bobcats. Deer, squirrel, rabbit, and bear are hunted as game, while muskrat, snakes, nutria, mink, opossum, bobcat, and skunk are commercially significant for fur. Prized game birds include quail, turkey, woodcock, and various waterfowl, of which the mottled duck and wood duck are native. There are several endemic plants and animals in Louisiana that are found nowhere else on Earth; an example could be the Louisiana bluestar or the white leucistic alligator. The Pearl river map turtle and the Ringed map turtle are only found in Louisiana and neighboring State of Mississippi.
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Traditionally the term jolly boat refers to a boat carried by a ship, powered by 4 or six oars and occasionally yawl rigged sails. The term might also refer to
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A Jollyboat is a New Zealand sailing dinghy designed by John Spencer. It is intended to be suitable for low cost home construction for sailing by teenagers or a parent and child.
Jolly Boat a 15-foot ketch rigged heavy open boat available in GRP and designed by famous yacht designer Laurent Giles and made by AJS Marine in Chichester. AJS marine brochureLake Martin, Louisiana
Lake Martin, located in St. Martin Parish, is a wildlife preserve and one of Louisiana's swamplands. The swamplands are home to a few trails as well as many different kinds of animals such as herons, egrets, ibis, bullfrogs, cottonmouths, alligators, and coypu (nutria) rats. Despite its classification as a wildlife reserve, however, there have been minor problems with litter and vandalism.List of domesticated meat animals
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The Marlin is a 14-foot 2/3 person sailing dinghy designed and built by Ian Proctor.
The rigging is very simple and straightforward, easy enough to sail in moderate breezes single handed, and in heavy breezes the mainsail can be reefed to reduce its area.Myocastorini
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Nutria fur, also known as coypu fur, is used in the fashion industry. It comes from the coypu, a South American rodent and cousin of the beaver.The Stainless Steel Rat
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Thrichomys is a genus of South American rodents in the family Echimyidae. It contains at least five species, found in Bolivia, Brazil and Paraguay. They are as follows:
Common punaré (Thrichomys apereoides)
Highlands punaré (Thrichomys inermis)
Sao Lourenço punaré (Thrichomys laurentius)
Paraguayan punaré (Thrichomys pachyurus)
Extant families in order Rodentia