The red-naped ibis (Pseudibis papillosa), also known as the Indian black ibis or black ibis, is a species of ibis found in the plains, agriculture fields and cities of the Indian subcontinent. Unlike other ibises in the region it is not found very often in waterbodies and is often found in dry fields, but are attracted more to areas that have more wetlands. It is usually seen in pairs or loose groups and can be identified by the nearly all dark body with a white patch on the shoulder and a bare dark head with a patch of crimson red warty skin on the crown and nape. It has a loud call and is noisy when breeding. It builds its nest most often on the top of a large tree or palm, and an increasing number of pairs are building on cell phone towers and electricity pillion towers.
Description
The red-naped ibis is a large black bird with long legs and a long downcurved bill. The wing feathers and tail are black with blue-green gloss while the neck and body are brown and without gloss. A white patch on the shoulders stands out and the top of the featherless head is a patch of bright red warty skin. The warty patch, technically a caruncle, is a triangular patch with the apex at the crown and the base of the triangle behind the nape that develops in adult birds. The iris is orange red. Both sexes are identical and young birds are browner and initially lack the bare head and crown. The bills and legs are grey but turn reddish during the breeding season. The toes have a fringing membrane and are slightly webbed at the base. They are usually silent but call at dawn and dusk and more often when nesting. The calls are a series of loud braying, squealing screams that descend in loudness. Nocturnal calling is rare and has been observed in urban settings. This species can be confused with the glossy ibis when seen at a distance but the glossy ibis is smaller, more gregarious, associated with wetlands and lacks the white on the wing and has a fully feathered head.
Taxonomy
The species was first given its scientific name by Temminck in 1824. He placed it in the genus Ibis but it was separated into the genus Inocotis created by Reichenbach and this was followed by several major works including the Fauna of British India although the genus Pseudibis in which Hodgson had placed the species had precedence based on the principle of priority. The species included the white-shouldered ibis as a subspecies P. papillosa davisoni from 1970s but that is now treated as a full, although closely related species. The main morphological difference between the two species is seen in the crown and the upper neck. While P. papillosa has a patch of red tubercles on the back of the crown, P. davisoni lacks it. Also, adult P. papillosa have a narrow, bright red mid-crown that becomes broader on the hindcrown, whereas, adult P. davisoni has a bare pale blue middle hindcrown that extends to the upper hindneck and forms a complete collar around the upper neck. Using nuclear and mitochondrial DNA, the species has been placed within the subfamily Threskiornithinae in a clade that includes both New and Old World members.
Distribution and habitat The red-naped ibis is widely distributed in the plains of the Indian subcontinent. In Rajasthan, it is common along the Aravalli mountains but entirely avoids using the trees on the mountains. The red-naped ibis uses lakes, marshes, riverbeds, irrigated farmlands, dry fallow fields, villages, towns and cities. More wetlands on the landscape attract a greater number of red-naped ibises, but birds forage largely in dry fields increasing use of wetlands for foraging during summer. In semi-arid areas, it is commonly seen in small flocks of 2–4, which could be family groups, with larger groups being relatively rare. Fewer ibises were counted in wetter locations and seasons. It is a common breeding resident in Haryana, Punjab, Rajasthan and the Gangetic plains. It extends into southern India but is not found in the forested regions or the arid zone of the extreme southeast of the peninsula or Sri Lanka. In lowland Nepal, most foraging red-naped ibis were seen in agricultural fields, but most nests were seen in forests. Red-naped ibis commonly use villages, towns and mega-cities seeking food, nesting and roosting. The red-naped ibis is largely diurnal in its foraging and other activities, at night roosting communally on trees or on islands. Nocturnal activities such as loud calling is rare. In semi-arid areas, they avoid potential competitive interactions with other sympatric ibis species by foraging largely in upland habitats.
Food and foraging
Early observers and investigations of stomach contents showed their diet to include crustaceans (prawns, crabs), insects (beetles, grasshoppers, crickets), scorpions, carrion and frogs. Subsequent additional observations have shown the red-naped ibis to be more omnivorous, feeding on carrion, insects, frogs, other small vertebrates, and grain. They forage mainly in dry open land and stubbly fields, sometimes joining egrets and other birds on land being tilled to feed on exposed earthworms, disturbed insects and dig for beetle grubs. They walk and like other tactile-feeding ibises, probe in the soft ground. The rarely wade in water but have been observed seeking out frogs hiding in crab holes. They feed commonly at garbage dumps eating mammal and bird carcasses. In small towns, red-naped ibis hunt adult Rock Pigeons and predate their eggs from nests on buildings. Near towns, ibises ate road kills and pulled out marrow of bones of cattle dead from collisions with traffic. During droughts they were seen feeding on carrion and insect larvae that were feeding on meat. They also feed on groundnut and other crops. In British India, indigo planters considered them useful as they appeared to consume a large number of crickets in the fields earning them the moniker "planter's friend". Adult and juveniles birds in Delhi dig into flowers of Bombax ceiba seemingly drinking nectar. Fishing by red-naped ibis is rare and has been observed in reservoirs. Ibises roost in groups and fly to and from the regularly used roost site in "V" formation.
Breeding
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