|Condor #534 soaring over the Grand Canyon, U.S.|
|Range map of California condor:
The California condor (Gymnogyps californianus) is a
The California condor was described by English naturalist
As of the 51st Supplement (2010) of the American Ornithologists' Union, the California condor is in the family
The California condor is the sole surviving member of Gymnogyps and has no accepted subspecies. However, there is a Late Pleistocene form that is sometimes regarded as a palaeosubspecies, Gymnogyps californianus amplus. Opinions are mixed, regarding the classification of the form as either a chronospecies or a separate species, Gymnogyps amplus. Gymnogyps amplus occurred over much of the bird's historical range – even extending into Florida – but was larger, having about the same weight as the Andean condor. This bird also had a wider bill. As the climate changed during the last ice age, the entire population became smaller until it had evolved into the Gymnogyps californianus of today, although more recent studies by Syverson question that theory.
The adult California condor is a uniform black with the exception of large triangular patches or bands of white on the underside of the wings. It has gray legs and feet, an ivory-colored bill, a frill of black feathers surrounding the base of the neck, and brownish red eyes. The juvenile is mostly a mottled dark brown with blackish coloration on the head. It has mottled gray instead of white on the underside of its flight feathers.
The condor's head has little to no feathers, which helps keep it clean when feeding on carrion. The skin of the head and neck is capable of flushing noticeably in response to emotional state. The skin color varies from yellowish to a glowing reddish-orange. The birds do not have true syringeal vocalizations. They can make a few hissing or grunting sounds only heard when very close.
The female condor is smaller than the male, an exception to the rule among
California condors have the largest wingspan of any North American bird. They are surpassed in both body length and weight only by the trumpeter swan and the introduced mute swan. The American white pelican and whooping crane also have longer bodies than the condor. Condors are so large that they can be mistaken for a small, distant airplane, which possibly occurs more often than that they are mistaken for other bird species.
The middle toe of the California condor's foot is greatly elongated, and the hind toe is only slightly developed. The
At the time of
In the 1970s, two Condor Observation Sites were established in the
The California condor lives in rocky
There are two sanctuaries chosen because of their prime condor nesting habitat: the Sisquoc Condor Sanctuary in the San Rafael Wilderness and the Sespe Condor Sanctuary in the Los Padres National Forest.
The Los Padres Condor Range and River Protection Act of 1992 expanded existing wilderness by 34,200 hectares (84,400 acres) and designated 127,900 hectares (316,050 acres) of new wilderness that provide habitat for the condor in the Los Padres.
Ecology and behavior
The California condor's large flight muscles are not anchored by a correspondingly large
The California condor has a long life span, reaching up to 60 years.
Condors begin to look for a mate when they reach sexual maturity at the age of 6.
The eggs hatch after 53 to 60 days of
In 2021, the San Diego Zoo reported having had two unfertilized eggs hatch within its breeding program in 2001 and 2009, producing male young by parthenogenesis as indicated by genetic studies. The mothers had been housed with males and had mated before, but the offspring lacked markers of male paternity and showed all-maternal inheritance, suggesting the specific mechanism of parthenogenesis involved automixis, gametic fusion, or endomitosis. Earlier evidence of similar parthenogenesis in birds found that among the known examples the embryos died before hatching, unlike these condor chicks. Neither chick lived to sexual maturity, preventing data collection on their reproductive potential.
Wild condors maintain a large home range, often traveling 250 km (160 mi) a day in search of carrion. It is thought that in the early days of its existence as a species, the California condor lived off the carcasses of the Pleistocene megafauna, which are largely extinct in North America. They still prefer to feast on large, terrestrial mammalian carcasses such as deer, goats, sheep, donkeys, horses, pigs, cougars, bears, or cattle. Alternatively, they may feed on the bodies of smaller mammals such as rabbits, squirrels, or coyotes, aquatic mammals such as whales and California sea lions, or salmon. Bird and reptile carcasses are rarely eaten. Condors prefer fresh kills, but they also eat decayed food when necessary. Since they do not have a sense of smell, they spot these corpses by looking for other scavengers, like eagles and smaller vultures, the latter of which cannot rip through the tougher hides of these larger animals with the efficiency of the larger condor. They can usually intimidate other scavengers away from the carcass, with the exception of bears, which will ignore them, and golden eagles, which will fight a condor over a kill or a carcass. In the wild they are intermittent eaters, often going for between a few days to two weeks without eating, then gorging themselves on 1–1.5 kilograms (2.2–3.3 lb) of meat at once.
The California condor conservation project may be one of the most expensive species conservation projects in United States history, costing over $35 million, including $20 million in federal and state funding, since World War II. As of 2007, the annual cost for the condor conservation program was around $2.0 million per year.
As the condor's population continued to decline, discussion began about starting a captive breeding program for the birds. Opponents to this plan argued that the condors had the right to freedom and that capturing all of the condors would change the species' habits forever, and that the cost was too great.
The study and capture of the remaining California condors was made possible through the efforts of Jan Hamber, an ornithologist with the Santa Barbara Museum of Natural History. Hamber personally captured AC-9, the final wild California condor, and her dedication to the bird's conservation led her to compile decades of field notes into the Condor Archives, a searchable database focused on condor biology and conservation.
The captive breeding program, led by the
Reintroduction to the wild
In 1988, the United States Fish and Wildlife Service began a reintroduction experiment involving the release of captive Andean condors into the wild in California. Only females were released, to eliminate the possibility of accidentally introducing a South American species into the United States. The experiment was a success, and all the Andean condors were recaptured and re-released in South America. California condors were released in 1991 and 1992 in California at Big Sur, Pinnacles National Park and Bitter Creek National Wildlife Refuge and in 1996 at the Vermilion Cliffs release site in Arizona near the Grand Canyon. The Fish and Wildlife Service designated the Arizona condors as an experimental, nonessential animal so they would not affect land regulations or development as ranchers were concerned they could be charged with an offense if any birds were injured on their property after the release. Though the birth rate remains low in the wild, their numbers are increasing steadily through regular releases of captive-reared adolescents.
Obstacles to recovery
In modern times, a wide variety of causes have contributed to the California condor's decline. Its low clutch size (one young per nest), combined with a late age of sexual maturity, make the bird vulnerable to artificial population decline. Significant past damage to the condor population has also been attributed to
Premature deaths among condor populations continued to occur due to contact with golden eagles, lead poisoning, and other factors such as power line collisions. Since 1994, captive-bred California condors have been trained to avoid power lines and people. Since the implementation of this aversion conditioning program, the number of condor deaths due to power lines has greatly decreased.
Lead poisoning due to fragmented lead bullets in large game waste is a particularly big problem for condors due to their extremely strong digestive juices; lead waste is not as much of a problem for other avian scavengers such as the turkey vulture and common raven. In California, the Ridley-Tree Condor Preservation Act went into effect July 1, 2008, requiring that hunters use non-lead bullets when hunting in the condor's range. Blood lead levels in golden eagles as well as turkey vultures has declined with the implementation of the Ridley-Tree Condor Preservation Act, demonstrating that the legislation has helped reduce other species' lead exposures aside from the California condor. There is no comparable anti-lead-bullet legislation in the other states in which the condor resides.
"Over 60 percent of the adult and juvenile deaths (that is, excluding chicks and fledglings) in the wild population have been as a result of lead poisoning" according to Dawn Starin in an article ("Condors or lead ammunition? We can't have both") published by The Ecologist in January 2015. She continues: "Because condors have been known to live past the age of 50, do not breed until they are at least six years old, and raise only one chick every other year, their populations cannot withstand the mortality rates caused by this neurological toxin."
Nesting milestones have been reached by the reintroduced condors. In 2003, the first nestling fledged in the wild since 1981. In March 2006, a pair of California condors, released by Ventana Wildlife Society, attempted to nest in a hollow tree near Big Sur, California. This was the first time in more than 100 years that a pair of California condors had been seen nesting in Northern California.
In October 2010, the wild condor population reached 100 individuals in its namesake state of California, plus 73 wild condors in Arizona. In November 2011, there were 394 living individuals, 205 of them in the wild and the rest in the San Diego Zoo Safari Park, the Santa Barbara Zoo, the Los Angeles Zoo, the Oregon Zoo, and the World Center for Birds of Prey in Boise, Idaho. In May 2012, the number of living individuals had reached 405, with 179 living in captivity. By June 2014, the condor population had reached 439: 225 in the wild and 214 in captivity. Official statistics from the December 2016 USFWS recorded an overall population of 446, of which 276 are wild and 170 are captive. A key milestone was reached in 2015 when more condors were born in the wild than died.
Reintroduction to Mexico
As the Recovery Program achieved milestones, a fifth active release site in Sierra de San Pedro Mártir National Park, Baja California, Mexico, was added to the three release sites in California and the release site in Arizona. In early 2007, a California condor laid an egg in Mexico for the first time since at least the 1930s.
In June, 2016, three chicks that were born in Chapultepec Zoo in Mexico City, were flown to Sierra de San Pedro Mártir National Park, Baja California, Mexico. In the spring of 2009, a second wild chick was born in the Sierra de San Pedro Mártir National Park and was named Inyaa ("Sun" in the Kiliwa language) by local environmentalists.
In 2014, Condor #597, also known as "Lupine", was spotted near Pescadero, a coastal community south of San Francisco. Lupine had been routinely seen at Pinnacles National Park after having been released into the wild at Big Sur the previous year. Younger birds of the central California population are seeking to expand their territory, which could mean that a new range expansion is possible for the more than 60 condors flying free in central California. Also in 2014 the first successful breeding in Utah was reported. A pair of condors that had been released in Arizona, nested in Zion National Park and the hatching of one chick was confirmed. The 1,000th chick since recovery efforts began hatched in Zion in May 2019. The California condor was seen for the first time in nearly 50 years in Sequoia National Park in late May 2020.
As part of an effort headed by the Yurok tribe to reintroduce the condor to the coastal redwoods of northern California, birds hatched at the Oregon Zoo and the World Center for Birds of Prey were released at Redwood National Park in 2022.
Condor Watch enabled volunteers, or
Relationship with humans
Throughout its historic range, the California condor has been a popular subject of
Condor bones have been found in Native American graves, as have condor feather headdresses. Cave paintings of condors have also been discovered. Some tribes ritually killed condors to make ceremonial clothing out of their feathers. Shamans then danced while wearing these to reach the upper and lower spiritual worlds. Whenever a Shaman died, his clothes were said to be cursed, so new clothing had to be made for his successor. Some researchers, such as Noel Snyder, believe that this practice of making ceremonial clothing contributed to the condor's decline.
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