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White-bellied Heron

A species of Great herons
Scientific name : Ardea insignis Genus : Great herons

White-bellied Heron, A species of Great herons
Botanical name: Ardea insignis
Genus: Great herons
White-bellied Heron (Ardea insignis) Photo By Ayuwat Jearwattanakanok

Description

This large heron is plain dark grey above with a long neck. The crown is dark and there are no black stripes on the neck as in the grey heron. In breeding plumage, it has a greyish-white nape plume and elongated grey breast feathers with white centers. The bill is black, greenish near the base and tip and the face is greenish grey. The bill is large and solid, with the culmen measuring 15.2–17.6 cm (6.0–6.9 in). The chin and central portion of the underside are whitish in color (per the common name), contrasting strongly against the dark grey color on the back. The legs are blackish with scale-like texture on the tarsus which measures 17.1 to 21.6 cm (6.7 to 8.5 in). In flight, it has a uniform dark grey upperwing and white underwing-coverts contrasting with dark grey flight feathers. The rump appears paler grey. At 127 cm (50 in) in height, it is the second largest heron on earth, after the Goliath heron. Included in the length, the mid-sized tail measures 19.9 to 21.6 cm (7.8 to 8.5 in). The wing chord measures 54.6 to 57.2 cm (21.5 to 22.5 in), with an estimated wingspan of 2 m (6.6 ft) or more. One estimate of body mass was relatively low at 2–2.6 kg (4.4–5.7 lb), however a deceased juvenile of the species reportedly weighed much more at 5.6 kg (12 lb). Another dead juvenile heron stood 1.58 m (5.2 ft) tall and weighed 8.51 kg (18.8 lb). These extremely high weights require verification, since they indicate this species can exceed even the typically larger Goliath heron in mass. On the ground it walks slowly, moving its neck slowly while looking from side to side. The Goliath species, beyond the average size difference, is distinguished by its chestnut neck while the slightly smaller great-billed heron is solid grey necked with the underside of the wings all grey. The usual call given when disturbed is a deep croak.
Size
1.3 m
Nest Placement
Tree
Feeding Habits
White-bellied Heron mostly preys on large fish, crayfish, insects, amphibians, reptiles, and small mammals. Feeding primarily occurs during the day, where white-bellied Heron exhibits patience, either wading through swift streams or strolling along banks. Typically solitary when feeding, though occasional winter gatherings suggest family foraging.
Habitat
The white-bellied Heron typically inhabits areas adjacent to riverine ecosystems, including inland swamps, marshes, and subtropical broadleaf forests. This heron favors mature forests for breeding purposes and selects less disturbed habitats with slower-flowing rivers and grassy marshes for residing outside the breeding season. The species shows a marked intolerance for disturbed or degraded environments and thus relies on undisturbed natural landscapes within broader subtropical regions.
Dite type
Piscivorous

General Info

Feeding Habits

Bird food type

Distribution Area

The white-bellied heron is found in the wetlands of tropical and subtropical forests in the foothills of the eastern Himalayas of India and Myanmar. It also occurs in Bhutan's sub-tropical areas and was once found in Nepal. The major threats the heron faces are poaching (both the bird itself and its eggs) and habitat destruction (cutting of nesting trees and the disappearance of wetlands). In Bhutan, white-bellied herons are found along the Punatsang Chu river especially in Pho-chhu river banks in Toewang Gewog, along Kami Chhu river) and in Lower Kheng (Berti). It can also be found in Madgechhu (Trongsa). A recently discovered nesting site in the Namdapha national park and Tiger Reserve in Arunachal Pradesh, India, is the first such breeding site outside of Bhutan.

Species Status

This species is rarer than previously believed. Indeed, it appears close to extinction. It has therefore been uplisted from endangered to critically endangered status in the 2007 IUCN Red List. In Bhutan, white bellied herons are found in the low elevation riparian habitat below 1700 m, particularly in the Punatsang Chhu (river) basin. About 30 individual birds are known within the river valley of Bhutan in the Punakha-Wangdiphodrang district in west central part of the country. It is under grave threat of extinction in Bhutan due to accelerated development of large-scale hydro-power projects in the basin. Rising water levels force the nesting birds to search extensively for fish, leaving the eggs or chicks exposed to predators such as the crested serpent eagle. A nesting site of white-bellied heron has been discovered in a remote part of the Namdapha Tiger Reserve in Arunachal Pradesh in 2014. It is estimated that there are only 250 white-bellied herons (Ardea insignis) left in the world and only about 50 left in India. The Department of Science and Technology, Government of India, has funded a three year study on the species with a view to document the foraging behaviour of the critically endangered bird.
White-bellied Heron (Ardea insignis) White-bellied Heron (Ardea insignis) Photo By Ayuwat Jearwattanakanok

Scientific Classification

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