White-Bellied Sea Eagle

The white-bellied sea eagle has a white head, rump and underparts, and dark or slate-grey back and wings. In flight, the black flight feathers on the wings are easily seen when the bird is viewed from below. The large, hooked bill is a leaden blue-grey with a darker tip, and the irides are dark brown. The cere is also lead grey. The legs and feet are yellow or grey, with long black talons (claws). Unlike those of eagles of the genus Aquila, the legs are not feathered. The sexes are similar. Males are 66–80 cm (26–31 in) long and weigh 1.8–3 kg (4.0–6.6 lb). Females are slightly larger, at 80–90 cm (31–35 in) and 2.5–4.5 kg (5.5–9.9 lb). The wingspan ranges from 1.78 to 2.2 m (5.8 to 7.2 ft). A 2004 study on 37 birds from Australia and Papua New Guinea (3 °S to 50 °S) found that birds could be sexed reliably on size, and that birds from latitudes further south were larger than those from the north. There is no seasonal variation in plumage. The moulting pattern of the white-bellied sea eagle is poorly known. It appears to take longer than a year to complete, and can be interrupted and later resumed from the point of interruption. The wings are modified when gliding so that they rise from the body at an angle, but are closer to horizontal further along the wingspan. …

The white-bellied sea eagle is found regularly from Mumbai (sometimes north to Gujarat, and in the past in the Lakshadweep Islands) eastwards in India, Bangladesh, and Sri Lanka in southern Asia, through all of coastal Southeast Asia including Burma, Thailand, Malaysia, Indonesia, Indochina, the main and offshore islands of the Philippines, and southern China including Hong Kong, Hainan and Fuzhou, eastwards through New Guinea and the Bismarck Archipelago, and Australia. In the northern Solomons it is restricted to Nissan Island, and replaced elsewhere by Sanford's sea eagle. In Victoria, where it is otherwise scarce, it is locally more common at Corner Inlet and Gippsland Lakes. Similarly in South Australia, it is most abundant along the north coast of Kangaroo Island. The range extends to the islands of Bass Strait and Tasmania, and it is thought able to move between the islands and the mainland. There is one unconfirmed record from Lord Howe Island and several from New Zealand. They are a common sight in coastal areas, but may also be seen well inland (It is reportedly seen at the Panna Tiger Reserve in central India, nearly 1,000 km (621 mi) away from the sea shore) The white-bellied sea eagle is generally sedentary and territorial, although it may travel long distances. They have been reported travelling upriver to hunt for flying foxes (Pteropus). …

The white-bellied sea eagle is generally territorial; some birds form permanent pairs that inhabit territories throughout the year, while others are nomadic. The species is monogamous, with pairs remaining together until one bird dies, after which the surviving bird quickly seeks a new mate. This can lead to some nest sites being continuously occupied for many years (one site in Mallacoota was occupied for over fifty years). Immature birds are generally dispersive, with many moving over 50 km (31 mi) away from the area they were raised. One juvenile raised in Cowell, South Australia was reported 3,000 km (1,900 mi) away at Fraser Island in Queensland. A study of the species in Jervis Bay showed increases in the numbers of immature and subadult birds in autumn, although it was unclear whether these were locally fledged or (as was considered more likely) an influx of young birds born and raised elsewhere in Australia. Birds are often seen perched high in a tree, or soaring over waterways and adjacent land. They are most commonly encountered singly or in pairs. Small groups of white-bellied sea eagles sometimes gather if there is a plentiful source of food such as a carcass or fish offal on a ship. Much of the white-bellied sea eagle's behaviour, particularly breeding, remains poorly known.

Breeding. …

The white-bellied sea eagle was important to different tribes of indigenous people across Australia. The guardian animal of the Wreck Bay aboriginal community, it is also the official emblem of the Booderee National Park and Botanic Gardens in the Jervis Bay Territory. The community considered localities around Booderee National Park to be connected with it. A local Sydney name was gulbi, and the bird was the totem of Colebee, the late 18th century indigenous leader of the Cadigal people. The white-bellied sea eagle is important to the Mak Mak people of the floodplains to the southwest of Darwin in the northern Territory, who recognised its connection with "good country". It is their totem and integrally connected to their land. The term Mak Mak is their name for both the species and themselves. The Umbrawarra Gorge Nature Park was a Dreaming site of the bird, in this area known as Kuna-ngarrk-ngarrk. It was similarly symbolic to the Tasmanian indigenous people—Nairanaa was one name used there. Known as Manulab to the people of Nissan Island, the white-bellied sea eagle is considered special and killing it is forbidden. Its calls at night are said to foretell danger, and seeing a group of calling eagles flying overhead is a sign that someone has died. …