Biak Paradise Kingfisher

Bird Overview

The adult Biak Paradise Kingfisher (Tanysiptera riedelii), including its dramatically elongated tail feathers, measures approximately 14 inches (36cm) in length. The distinctive tail streamers have bare shafts on most of them and broadened racket tips at the ends. This gives the bird an impressive silhouette when it flies or perches.

The crown, nape and sides of the heads, as well as the upperparts are a vibrant turquoise-blue that shimmers in sunlight. The pure white of the rump, and white feather bases on its tail, contrasts wonderfully with this. The bird’s underparts, which are bright white as well, stand out against its richly colored upper feathers.

The dark underwings, which are almost black in color, create a subtle contrast when flying. The long, robust, vibrantly red bill of the bird is perfectly adapted to grabbing insects, small lizards and other prey on the forest floor or in low branches. The blue head plumage frames its dark, alert eyes. Its bright red feet finish its colorful look.

This paradise-kingfisher’s stunning plumage and elongated tail feathers are not just ornamental they likely play a role in courtship displays and territorial defense. The males call loudly, and their notes can be heard through the dense forest canopy.

Bird Group

The Biak paradise kingfisher is a species of tree kingfisher endemic to Biak Island in Indonesia. It is a part of the Alcedinidae, specifically Halcyoninae within the order Coraciiformes.

Identification

Biak’s only paradise-kingfisher is Tanysiptera riedelii, a stunning bird that is an island endemic. This common kingfisher has a long tail and can be found in both primary and second-growth forests. It also inhabits degraded woodlands and forest edges. Its ability to adapt to disturbed habitats allows it to be more resilient to habitat change than other forest specialists.

The dark blue upperparts are adorned with pale-blue flecked patches at the tail, head and shoulders. White underparts contrast with the vibrant blues in its plumage. The bright red feet and strong red bill add to the colorful appearance of this bird. The Biak-Kingfisher eats mostly insects, small invertebrates and other prey by perching and swooping to the forest or low vegetation. The bird is known to catch small lizards, and sometimes other prey. The loud, ringing call of this bird can be heard through the canopy before it is even seen.

Songs & Calls

The Biak Paradise-Kingfisher’s calls include a slightly arhythmic series of soft, whistled “piu” notes and a rising, accelerating sequence of sharper “puuu puu pipipipipipi!” often performed in duets by mated pairs. These vocalizations are used as territorial signals, and they help to strengthen the bond between mated pairs during breeding season. The calls are heard most at dawn and dusk, when the birds are active. Their clear tones and carrying tones make them ideal for communicating in dense forests where visibility is restricted.

Location

The Biak paradise kingfisher is a tree kingfisher endemic to Biak, an Indonesian island that is part of a small cluster of islands in Cenderawasih Bay on the northern coast of Papua.

Habitat

The Biak Paradise-Kingfisher’s primary habitat is the lowland tropical forests of Biak Island, situated in Cenderawasih Bay, just north of New Guinea. It is found in dense, humid rainforests with a tall canopy that provides shade. The understory also has a lot of vegetation. In these lush habitats, nesting cavities and insect life are abundant. Natural waterways and clearings in the forest provide habitats that are more suitable for birds. They can also be used as hunting grounds, where they can perch to scan for prey.

The Biak Paradise Kingfisher is not limited to primary forests. It can also be found in secondary forests, forest edges and even landscapes that have been altered by humans, such as gardens, plantations and villages. It can survive in disturbed habitats as long as it has enough tree cover and food. The species’ flexibility could help it to survive despite habitat loss. However, large-scale fragmentation and deforestation are still potential threats. The ability of the species to adapt to degraded habitats indicates some resilience to environmental change, but intact lowland rain forest still represents its most important habitat.

Behaviour 

Direct studies on the Biak Paradise-Kingfisher’s behavior are limited, it is thought to share many traits with its close relative, the Common Paradise-Kingfisher (Tanysiptera galatea) of mainland New Guinea. This species may be a perch and pounce hunter. It prefers low branches or exposed perches in the middle of the forest. It scans the ground from these perches for movement and then dives with precision to capture insects, earthworms or spiders. According to iNaturalist, this species is well documented.

The bird’s typical hunting method involves a rapid glide or fluttering flight followed by a return back to a perch nearby to consume the catch. The Biak Paradise Kingfisher will also occasionally catch prey in the air, from the trunk of a tree, or on the leaf litter. This flexible foraging strategy shows its ability to adapt to the varying availability of prey in both primary and secondary forest. According to Bug Guide, this species is well documented.

It is believed that the species is territorial. Individuals or pairs defend feeding and nesting sites through loud, ringing vocalizations and visual displays. Males use their vivid plumage and striking tail streamers in courtship rituals during the breeding season. They may perform aerial chases or present food to females. Outside of the breeding season, these kingfishers tend to be solitary, or in pairs. They are quiet except when they call or forage.

Feeding

The Biak Paradise Kingfisher feeds primarily on insects and other small invertebrates found within its forest habitat. Its diet consists of beetles and other insects, such as ants, caterpillars and spiders. It can use its sharp, red bill to probe beneath leaf litter and bark in order to find hidden prey. The kingfisher hunts opportunistically and is active. It can be seen darting quickly through the undergrowth to catch insects.

The Biak Paradise Kingfisher will occasionally supplement its diet with small lizards and other vertebrates, if available. The species is known to eat fruits and berries during times when insect populations are low, like in the dry months. The species can thrive despite environmental fluctuations because of its seasonal flexibility in diet. In the rainy season, when insect activity is at its peak, the species’ feeding habits are almost exclusively animal prey. It is believed that this adaptability helps the Biak Paradise Kingfisher survive in both degraded and pristine forests.

Biak Paradise Kingfishers are primarily insectivores. However, they also enjoy fruits. In your feeder, mix finely chopped fruit like papayas and bananas to attract this species. Mixing live mealworms with dried ones can be a tasty treat.

Breeding

Although the breeding habits of Biak Paradise Kingfisher have not been well documented, observations of closely-related paradise-kingfishers can provide valuable insight. The nest is thought to be in hollow branches or woodpecker holes in the forest canopy. It may nest in arboreal termite nests by excavating an interior chamber. These elevated nesting sites protect eggs and chicks against predators on the ground and floods during heavy rains.

As with other Tanysiptera species, the clutch is small and usually consists of 2 to 4 glossy white eggs. The parents may take turns keeping the eggs warm, then feeding the chicks an assortment of insects, small snakes and other prey. While the long tails of adults are a distinctive feature, they may also be used in courtship displays. Males might perform aerial chases, or perch prominently, to attract females.

Breeding occurs during the rainy season when the insect population is at its highest, providing a plentiful food source for growing chicks. Further studies are required to confirm this behavior and to better understand the breeding biology of this endangered species.

Conservation

On the IUCN Red List the Biak Paradise Kingfisher (Tanysiptera riedelii), is classified as Endangered, a reflection of its small population and the serious threats it faces within its restricted range. This striking bird, which is endemic to Biak island in Indonesia, is extremely vulnerable to habitat destruction due to widespread deforestation and logging, as well as land conversion to agriculture and settlements. Biak Island’s lowland forest has been fragmented or cleared in large areas, making it harder for the bird to find suitable nesting and feeding grounds.

According to estimates, the population has been reduced to just a few forest patches and continues to decrease due to habitat degradation. Conservation efforts have been launched to protect the remaining primary forests and secondary forest of Biak. Initiatives are being taken to stop illegal logging, reforest degraded areas and protect critical habitats. Conservation programs also engage local communities with environmental education and sustainable land use practices. They emphasize the importance of protecting the island’s biodiversity.

The challenges are still significant despite these initiatives. The species’ survival is threatened by the weak enforcement of environmental laws, and the growing demand for agricultural land. The Biak Paradise Kingfisher could face an even higher risk of extinction if there are no stronger protection measures in place and forest habitats are not preserved. The success of long-term conservation will depend on a combination of habitat restoration, local stewardship, and legal protection.

Risks / Threats

Biak Paradise Kingfisher is threatened by habitat degradation and loss across its small range. The forests of Biak Island are heavily affected by illegal and legal logging, as well as clearing land for subsistence agriculture. In recent decades, large-scale commercial logging has become economically unfeasible. However, deforestation on a small scale and agricultural expansion have continued to fragment the forest. Satellite monitoring of the past 20-year period suggests that forest cover loss was relatively slow. The maximum rate estimated for the last decade is 3 to 4%. Even this slow loss is alarming for an animal that relies on intact forests.

The Biak Paradise Kingfisher is tolerant of degraded habitats but still relies on a substantial forest cover to nest and forage. The ongoing decline of both the size and quality its habitat has been attributed to a gradual but steady decrease in the population. These pressures could escalate if conservation measures such as habitat protection or reforestation are not taken.