Palm cockatoo (Probosciger aterrimus)

A large, black cockatoo native to New Guinea, the Aru Islands and northern Australia, noted for its powerful bill, red facial patch, slow breeding and distinctive drumming behaviour.

Overview

The palm cockatoo (Probosciger aterrimus), sometimes called the goliath cockatoo, is a large, predominantly black parrot and the sole living species of its genus. It is best known for its imposing, curved beak, bare facial patch that can flush red, and unusual social behaviours. Found in tropical forests and woodlands, the species has attracted interest from ornithologists because of its tool use and long life span in both wild and captive settings.

Appearance and distinguishing features

Palm cockatoos are large and robust with a heavy, hooked bill adapted for cracking open hard seeds and palm fruits. Adults have dark grey to black plumage, a prominent erectile crest, and a bare patch of facial skin that varies in colour and brightness; this patch can become more vividly coloured during displays. Juveniles typically show duller plumage and less-developed facial colouring. Key characteristics include:

Large bill adapted to break nuts and palm fruits.
Prominent crest used in visual signalling.
Bare facial patch that changes tone during excitement or courtship.

Behavior and notable habits

Palm cockatoos are often observed alone or in small groups rather than large flocks. They are notable for a rare behaviour among parrots: males fashion a stick or seed pod and use it to drum loudly on a hollow tree or branch as part of a display. This drumming appears to function in long-distance communication and mate attraction and is regarded as an example of tool use in birds. The species has a slow reproductive rate and invests heavily in each chick, which contributes to low population recovery after declines.

Diet and feeding

The diet consists primarily of hard seeds and fruits, especially those of palms and other native trees. The bird uses its powerful bill to open tough shells and often manipulates items with its beak and feet. In captivity, caretakers typically provide a balanced mix of formulated pellets, fresh fruits, vegetables, and safe nuts to meet nutritional needs, but care plans must reflect the species' strong chewing instincts and social needs.

Distribution, habitat and conservation

Palm cockatoos occur across New Guinea, the Aru Islands and parts of northern Australia, including Cape York Peninsula. They favour tall tropical woodland, gallery forest, and areas with abundant large trees used for nesting. Pressures on populations include habitat loss through land clearance and mining, occasional trapping for the pet trade, and the species' naturally low reproductive output. Conservation measures focus on habitat protection, nest-site preservation, and monitoring population trends.

Human relationships and captive care

Because of their intelligence, striking appearance and longevity, palm cockatoos are sometimes kept in captivity, but they require experienced care. Potential owners and institutions must consider their need for mental stimulation, large enclosures, and diets that prevent nutritional deficiencies. Breeding in captivity is uncommon and challenging. For further reading and specialist resources see classification and family overview, cockatoo group information, and regional pages such as genus details, Cape York ecology, Australian bird resources and New Guinea avifauna.

Overall, the palm cockatoo is a distinctive and ecologically important species with remarkable behaviours. Continued study and habitat protection are key to ensuring its persistence in the wild.