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Torresian Imperial Pigeon
Ducula-spilorrhoa-02
Information
Common Name Nutmeg Pigeon, White Nutmeg Pigeon, Australian Pied Imperial Pigeon and Torres Strait Pigeon
Range Australia (north-east Western Australia, north Northern Territory and north Queensland, including the Torres Strait Islands), New Guinea, Aru Islands, islands in the Geelvink Bay, D'Entrecasteaux Islands and Louisiade Archipelago.
Scientific Classification
Kingdom Animalia
Phylum Chordata
Class Aves
Order Columbiformes
Family Columbidae
Genus Ducula
Species Ducula spilorrhoa
Conservation Status
LCSpecies
Least Concern

The Torresian imperial pigeon (Ducula spilorrhoa), also known as the nutmeg pigeon, white nutmeg pigeon, Australian pied imperial pigeon or Torres strait pigeon, is a species of relatively large, pigeon in the Columbidae family. It is found in forest, woodland, savanna, mangrove and scrub in Australia (north-east Western Australia, north Northern Territory and north Queensland, including the Torres Strait Islands), New Guinea, Aru Islands, islands in the Geelvink Bay, D'Entrecasteaux Islands and Louisiade Archipelago. It has also been recorded as a vagrant in New South Wales, Australia. As far as known, most populations are resident or only take part in minor local movements, but the population in Queensland leaves for New Guinea in February–April and returns in July–August.

Taxonomy

Its taxonomy is confusing and remains unsettled. It has sometimes been considered a subspecies of the pied imperial pigeon. When recognized as a separate species, the number of subspecies of the Torresian imperial pigeon also remains unsettled. Many recognize two: The widespread Ducula spilorrhoa spilorrhoa (nominate) and Ducula spilorrhoa constans of the Kimberleys. However, the latter is sometimes considered a junior synonym of former. Alternatively, it has been argued that it should be considered a separate species, the Kimberley imperial-pigeon (Ducula constans Bruce, 1989). Two additional taxa, subflavescens of the Bismarck Archipelago and melanura of the Moluccas, have been associated with the Torresian imperial pigeon. The former has a distinctive yellowish-tinged plumage and a bluish basal half of the bill, and is increasingly treated as a separate species, the yellowish imperial pigeon (Ducula subflavescens). Most recent authorities place melanura under the Pied Imperial pigeon, but it has black spotting to the undertail coverts and a greenish-yellow bill similar to the Torresian imperial pigeon. However, melanura also has a significantly broader black tail-tip than the Torresian imperial pigeon.

Description

The Torresian imperial pigeon is a large plump pigeon, 38-44 centimetres (15-17.5 inches) in length, and with a 45 cm (18 in) wingspan. It is entirely white or pale cream, apart from the black flight feathers (remiges), part of the tail (rectrices) and spots on the undertail coverts. The head can be brown, soiled by eating fruit.

Behavior

The flight of the pigeon is fast and direct, with the regular beats and an occasional sharp flick of the wings which are characteristic of pigeons in general.

Breeding

The male displays by flying up steeply, pausing, tipping forward and then gliding downwards. The female builds an untidy stick nest in a tree, usually a coconut palm and lays a single white egg, which hatches within 26 to 28 days. The squab fledges after another three weeks. In Australia they breed between August and January in mangroves, vines, palm fronds on off-shore islands, such as the Brook Islands. In north-east Queensland, they migrate daily as flocks from the islands to the mainland rainforests to eat fruit, returning to the islands at dusk.

Feeding

This is an arboreal dove, feeding almost exclusively on fruit. It can swallow fruits with very large seeds, the latter being regurgitated or excreted whole, depending on size, after the pulp has been removed.

Calls

Calls made by the birds are a deep "mrrrooooo", "roo-ca-hoo" and "up-ooooo".

Status

The birds were once present in large colonies in Cairns, Australia. Edmund Banfield wrote in 1908 that in Dunk Island "fully 100,000 come and go evening and morning", with flying colonies as wide as two miles. It was described by Harold Frith in 1982, who stated these processions as "one of the great ornithological experiences of the tropics." However, the birds were subject to mass slaughter in the 19th and early 20th Centuries because they were thought of as pests or easy targets for recreational shooting. Populations dropped rapidly before conservation activists such as Margaret and Arthur Thorsborne led a campaign to protect them and monitor their numbers.

The population is now slowly increasing because of their protected status in Australia, where there are now an estimated 30,000. The species remains locally fairly common in parts of its range, and is therefore considered to be of least concern by BirdLife International and IUCN.

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