Polynesian Starling

Aplonis tabuensis

Order: Passeriformes / Family: Sturnidae

Wikimedia Commons

black brown green medium songbird tropical forest urban common widespread year-round widespread

About the Polynesian Starling

The Polynesian Starling, scientifically known as Aplonis tabuensis, holds a significant place in the avifauna of the Pacific islands. Its distribution across various island groups, from Samoa to Tonga, exemplifies its adaptability. This bird thrives in a range of environments including coastal areas, lowland forests, and even urban settings. The Polynesian Starling plays an integral part in seed dispersal, contributing to the maintenance of healthy forest ecosystems. The bird's ability to adapt to different habitats is a crucial trait, especially in the face of habitat destruction and climate change impacting many Pacific islands.

Aplonis tabuensis is often observed in small flocks, foraging for fruits and insects. Its diet and foraging habits make it an essential component of its ecosystem. By consuming and subsequently dispersing the seeds of various fruiting plants, the Polynesian Starling aids in the regeneration of vegetation. This role becomes increasingly important as native plant species face competition from invasive flora introduced to the islands.

Ecologically, the Polynesian Starling is a generalist, demonstrating flexibility in its feeding and nesting habits. During the breeding season, which varies slightly across its range, the starling exhibits territorial behavior. They use cavities in trees or cliffs for nesting, often lining their nests with grass and leaves. This species, while not currently threatened, serves as an indicator of environmental health across the islands. Its presence or absence can provide insights into the state of native habitats, making it an important subject for ongoing ornithological studies.

The Polynesian Starling belongs to the family Sturnidae, within the order Passeriformes. These birds typically live average 5-8 years in the wild..

How to Identify a Polynesian Starling

The Polynesian Starling displays a distinctive combination of shimmering iridescent feathers and a medium-sized body. Adult starlings exhibit a predominantly dark plumage with an oily green sheen, which becomes more pronounced in bright sunlight. Juveniles tend to have duller coloration, often appearing more brownish, which helps them blend into their surroundings. Both males and females share similar plumage characteristics, making them difficult to distinguish based on appearance alone.

In flight, the Polynesian Starling exhibits a robust silhouette with a moderate wingspan and a slightly rounded tail. While perched, it maintains an upright posture, often seen on tree branches or telephone wires. This posture, combined with its glossy plumage, makes it fairly distinguishable from other birds in its habitat.

Despite its distinctive features, the Polynesian Starling can sometimes be confused with other members of the Sturnidae family, particularly the Metallic Starling, which shares similar iridescence. However, differences in size and the specific sheen of their feathers aid in accurate identification.

Having trouble telling birds apart? Upload a photo to our bird identification tool for an instant species match.

Polynesian Starling Habitat and Range

Preferred Habitat

The Polynesian Starling inhabits a diverse range of environments, primarily across the islands of the Pacific Ocean. It commonly occupies lowland rainforests, coastal woodlands, and even urban areas where trees and shrubs are available. The bird is typically found from sea level up to elevations of around 1,000 meters, though it prefers areas where fruiting trees are plentiful.

Seasonal movements within its range are minimal, as the Polynesian Starling is largely sedentary. However, it may shift slightly within an island to take advantage of fluctuating food resources. In urban settings, this starling adapts well, often seen in gardens and parks where its food sources are abundant.

Geographic Range

The Polynesian Starling is primarily found in the islands of Oceania, including Samoa, Tonga, and Fiji. Its range covers a wide swath of the central and western Pacific, extending to smaller island groups such as Niue and Wallis and Futuna. Unlike many other bird species, the Polynesian Starling does not undertake long migratory journeys, instead remaining within its established range year-round.

Population density varies, with higher concentrations in areas where fruiting trees and suitable nesting sites are plentiful. Islands with large tracts of preserved natural habitat tend to support healthier populations of the Polynesian Starling. This bird's presence across numerous islands highlights its adaptability and ecological importance within these regions.

Want to know which birds visit your area? Browse our backyard birds by location guides for region-specific species lists.

What Does the Polynesian Starling Eat?

The Polynesian Starling primarily feeds on fruits, making it a crucial seed disperser in its ecosystem. Its diet consists of berries, figs, and a variety of other fruiting bodies found in the Pacific islands' forests. Insects also play a secondary role in its diet, providing necessary proteins, particularly during the breeding season when energy demands increase.

Foraging occurs throughout the day, with peak activity in the early morning and late afternoon. This timing coincides with the availability of insects and the ripening of fruits. The Polynesian Starling employs a range of foraging techniques, from gleaning fruits off branches to catching insects mid-flight. The size of prey and fruit varies, but the bird typically selects items that are easily manageable within its medium-sized bill.

Polynesian Starling Behavior and Social Structure

The Polynesian Starling exhibits a variety of social and territorial behaviors. Outside of the breeding season, these birds often gather in small flocks, which allows them to forage more efficiently and provides protection against predators. During the breeding season, however, they become more territorial, with pairs defending their nesting sites aggressively against intruders.

Courtship displays are subtle but include vocalizations and mutual preening. While generally not as vocal as some other starlings, the Polynesian Starling uses a repertoire of calls to communicate within flocks and between mates. In response to potential threats, they may employ mobbing behavior, where multiple starlings collectively drive away predators.

Daily activity patterns revolve around foraging, with breaks taken for preening and rest during the hottest parts of the day. This behavior ensures that they maintain their glossy plumage, which is crucial for both social interactions and thermoregulation.

Polynesian Starling Nesting and Reproduction

The Polynesian Starling primarily nests in natural cavities found in trees or cliffs. It often uses old woodpecker holes or crevices created by natural erosion. Nests are lined with soft materials such as grass, leaves, and feathers, providing insulation and comfort for the developing chicks.

Clutch size typically ranges from two to four eggs, with both parents sharing incubation duties over a period of approximately 14 days. Once hatched, the chicks remain in the nest for about three weeks, during which time they are fed a diet rich in fruits and insects by both parents. The number of broods per year can vary based on environmental conditions, but typically the Polynesian Starling raises one to two broods annually.

Polynesian Starling Sounds and Vocalizations

The song of the Polynesian Starling is a series of melodic whistles and warbles, characterized by its rhythmic and fluctuating pitch. Its calls are less complex than those of some other starlings, often consisting of simple chirps and squawks used for communication within flocks. Alarm calls are sharper and more urgent, serving to alert other birds to potential dangers.

The dawn chorus is a notable feature of the Polynesian Starling's daily routine, with their calls contributing to the vibrant soundscape of the island mornings. Comparatively, their song lacks the harshness found in some of their mainland relatives, opting instead for a smoother, more pleasant delivery.

Interesting Facts About the Polynesian Starling

1The Polynesian Starling can be found on over 30 islands, showcasing its wide adaptability across the Pacific.
2This starling's iridescent feathers are not due to pigments but rather microscopic structures that refract light.
3Polynesian Starlings are known to use human-made structures like buildings for nesting in urban areas.
4While not migratory, the Polynesian Starling may shift its range slightly in response to food availability.
5The Polynesian Starling aids in the regeneration of tropical forests by dispersing seeds over large areas.

Polynesian Starling Conservation Status

Currently, the Polynesian Starling holds a status of Least Concern according to the IUCN Red List, with stable population trends across most of its range. However, the species faces potential threats from habitat loss due to deforestation and land-use changes. Invasive species, particularly rats and cats, pose additional risks by preying on eggs and young birds. Conservation efforts focus on habitat preservation and the control of invasive species to ensure the Polynesian Starling's continued survival. Historical population changes reflect the resilience of this species, though ongoing monitoring and habitat protection remain crucial.