Snakebird, Darter, Water crow, American darter, Water turkey
The anhinga (Anhinga anhinga) is a water bird related to cormorants and pelicans. The word anhinga comes from the Brazilian Tupi language and means "devil bird" or "snake bird". Anhingas are skillful swimmers with unique characteristics that help them when hunting for fish. Their feathers provide less buoyancy than ducks, so they are able to dive under the water, and swim with just their thin necks above the water, earning them the nickname of the "snake bird".
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DiurnalDiurnal animals are active during the daytime, with a period of sleeping or other inactivity at night. The timing of activity by an animal depends ...
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CarnivoreA carnivore meaning 'meat eater' is an organism that derives its energy and nutrient requirements from a diet consisting mainly or exclusively of a...
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PiscivoresA piscivore is a carnivorous animal that eats primarily fish. Piscivorous is equivalent to the Greek-derived word ichthyophagous. Fish were the die...
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SemiaquaticSemiaquatic animals are those that are primarily or partly terrestrial but that spend a large amount of time swimming or otherwise occupied in wate...
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AltricialAltricial animals are those species whose newly hatched or born young are relatively immobile. They lack hair or down, are not able to obtain food ...
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PredatorPredators are animals that kill and eat other organisms, their prey. Predators may actively search for or pursue prey or wait for it, often conceal...
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Soaring birdsSoaring birds can maintain flight without wing flapping, using rising air currents. Many gliding birds are able to "lock" their extended wings by m...
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NatatorialNatatorial animals are those adapted for swimming. Some fish use their pectoral fins as the primary means of locomotion, sometimes termed labriform...
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TerritorialA territory is a sociographical area that which an animal consistently defends against the conspecific competition (or, occasionally, against anima...
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OviparousOviparous animals are female animals that lay their eggs, with little or no other embryonic development within the mother. This is the reproductive...
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CongregatoryCongregatory animals tend to gather in large numbers in specific areas as breeding colonies, for feeding, or for resting.
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MonogamyMonogamy is a form of relationship in which both the male and the female has only one partner. This pair may cohabitate in an area or territory for...
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Generally solitaryGenerally solitary animals are those animals that spend their time separately but will gather at foraging areas or sleep in the same location or sh...
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ColonialColonial animals live in large aggregations composed of two or more conspecific individuals in close association with or connected to, one another....
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Partial MigrantPartial migration is when within a migratory species or even within a single population, some individuals migrate while others do not.
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starts withThe anhinga is a large bird. Its bill is relatively long (about twice the length of the head), sharply pointed, and yellow, and the webbed feet are yellow as well. The male is a glossy black-green with the wings, base of wings, and tail a glossy black-blue. The tip of the tail is white. The back of the head and the neck have elongated feathers that have been described as gray or light purple-white. The upper back of the body and wings is spotted or streaked with white. The female anhinga is similar to the male except that it has a pale gray-buff or light brown head, neck, and upper chest. The lower chest or breast is a chestnut color, and the back is browner than that of the male. The hatchling starts out bald but gains tan down within a few days of hatching. Within two weeks the tan down is replaced by white down. Three weeks after hatching, the first juvenile feathers appear. Juveniles are mostly brown until they first breed usually after the second or third winter.
Anhingas live all year round in southwest coastal areas of the United States, from North Carolina to Texas. They are also found in Central America, Mexico, Panama, and Cuba, and in South America from Colombia to Ecuador, and in the east of the Andes to Argentina. Only birds that live in the extreme north and south of their range migrate and do so based on temperature and available sunlight. Anhingas will migrate towards the equator during winter but this range is "determined by the amount of sunshine to warm the chilled birds". Although not in their usual range, anhingas have been found as far north as the states of Pennsylvania and Wisconsin in the United States. Anhingas live in tropical and subtropical areas. They prefer warm shallow waters that are fresh or brackish and can sometimes be found on coasts. They live near lakes, rivers, marshes, and mangrove swamps with tall trees and thick vegetation, and in shallow lagoons and bays.
Anhingas are diurnal and generally solitary but may gather with cormorants, herons, ibises, and storks. They will nest with their species and other birds in loose colonies but do not associate with other anhingas aside from in nesting colonies. These birds are highly territorial, engaging in exaggerated displays when defending their nest site: spreading their wings and snapping their beak to threaten an intruder, leading to a fight if necessary, pecking each other on the neck and head. When they are in the water they spend most of their time fishing, otherwise, they will be found perched in trees. They often crawl out of the water to find a high perch so they can sun themselves. As with turkey vultures and cormorants, anhingas will spread out their wings to the sun themselves, which dries out their plumage, absorbing heat from the sun. They lose heat quickly in water as they have no layer of body feathers to provide insulation, thus, the sun's heat helps them to maintain their body temperature. Anhingas are usually quiet birds, but they communicate vocally when they need to producing clicks, rattles, grunts, and croaks.
Anhingas are carnivores (piscivores), they mostly eat fish, but will also feed on aquatic invertebrates, amphibians, insects, and reptiles.
Anhingas are monogamous, forming strong pair bonds, which last for life. During courtship, anhingas perform flying displays, soaring towards their nest from a great height. Birds in Mexico perform a particular display when they are at the nest, vocalizing to each other, and stretching their neck towards their mate. Breeding is seasonal in North America. In latitudes that are subtropical or tropical, breeding can be throughout the year, or triggered by dry or wet seasons. Anhingas usually nest in colonies, sometimes with other bird species. The nest is built by both adults and is used then from year to year. 2 to 5 eggs are laid and incubation is for around 25 to 30 days, done by both parents. Chicks are naked and helpless when they hatch and may have some dark and white down along their sides. They are brooded for 12 days by both parents and remain in their nest for three weeks. Then they climb out of their nest onto a branch, and they fledge at about 6 weeks old. The young stay for several more weeks with their parents before becoming independent and reaching maturity when they are about 2 years old.
In the Americas, this species is abundant, despite their aquatic habitats being threatened. DDT (poison) has had an effect on their reproductive success, and banning this pesticide in the United States has benefited those populations that breed in the south of the country.
According to the All About Birds resource, the total breeding population of the anhinga is 83,000 individuals. Currently, this species is classified as Least Concern (LC) on the IUCN Red List but its numbers today are decreasing.
