- Related Topics:
- vulture
- California condor
- Andean condor
- Cathartidae
condor, either of two large New World vultures—the Andean condor (Vultur gryphus) and the California condor (Gymnogyps californianus)—that are two of the largest flying birds. Wingspans up to 3.2 metres (10.5 feet) have been reported for male Andean condors, and adult California condors typically reach 2.9 metres (9.5 feet). From beak to tail, the body of each is about 1.2 metres (4 feet) long. Male Andean condors may weigh up to 15 kg (33 pounds), and female Andean and both sexes of California condors may reach 11 kg (24 pounds) in weight.
Andean condor
The male Andean condor is a black bird with grayish white wing feathers, a white fringe of feathers around the neck, and a bare red or pinkish head, neck, and crop. Males have a large caruncle, or fleshy protuberance, on the forehead and top of the beak, and turkeylike neck wattles. The species ranges throughout the Andes Mountains of South America, frequenting open country and feeding on carcasses. When hunting for prey, the Andean condor soars on thermals (warm updrafts that rise from the land below) and upslope winds to remain aloft and can glide for more than 160 km (100 miles) without flapping its wings. In Peru and Chile it descends to the Pacific coast, where it feeds on dead marine animals such as seals and fish.
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Andean condors are rare in northern South America but still relatively common in the southern part of their range. About 6,700 adult Andean condors remain, and the International Union for Conservation of Nature and Natural Resources (IUCN) has classified the species as near threatened.
They breed every other year unless the hatchling dies, in which case the pair breeds again the following year. The young are raised on remote ledges and in caves at altitudes above 3,000 metres (10,000 feet), using no nesting material. The white egg measures about 12 cm (4.5 inches) long.
California condor
Adult California condors are mostly black, with bold white wing linings and a bare red-to-orange head, neck, and crop. Young birds have a dark head that gradually becomes red as they near adulthood at about six years of age. They forage in open country and feed exclusively on carrion. California condors nest in cliffs, under large rocks, or in other natural cavities, including holes in redwood trees. They generally breed every other year, laying a single unmarked greenish white egg measuring about 11 cm (4 inches) long. Although most California condors reproduce sexually, some female birds have been able to reproduce asexually through parthenogenesis. In 2021 researchers reported that two captive female birds produced chicks that hatched from unfertilized eggs.
The California condor is critically endangered. By 1982 only 20 remained in the wild, and efforts were made to establish a captive breeding flock in zoos. Because of excessive mortality from lead poisoning and shooting, the wild population continued to decline, and in 1987 the last free-flying survivor was trapped and taken into protective captivity. The first successful captive breeding occurred in 1988, and numerous captive progeny were released to the wild beginning in 1992. These conservation efforts enabled the total California condor population to reach 289 by mid-2006, including 138 wild birds in southern and central California, northern Arizona, and northern Baja California, Mexico. In 2002 the first egg to be laid in the wild by captive-raised condors hatched, and by mid-2010 44 adults had produced viable offspring in the wild. By 2020 the wild population numbered more than 300, with some 180 living in captivity.
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The Editors of Encyclopaedia BritannicaThis article was most recently revised and updated by John P. Rafferty.
