Olive-backed Tailorbird

Orthotomus sepium

Order: Passeriformes / Family: Cisticolidae

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About the Olive-backed Tailorbird

The Olive-backed Tailorbird (Orthotomus sepium) is a small, vibrant passerine bird belonging to the Cisticolidae family, prevalent in the tropical and subtropical regions of Southeast Asia. This species is renowned for its intricate nest-building abilities, a trait common to tailorbirds, where their name originates. They ingeniously sew leaves together with plant fibers or spider silk to form a cradle for their nests. Primarily found in Indonesia, particularly on the islands of Java and Bali, the Olive-backed Tailorbird is adapted to a variety of habitats from lowland forests and mangroves to gardens and plantations, showcasing its adaptability. Its presence in forest edges and secondary growth highlights its role in the ecological dynamics of these environments, often aiding in insect control through its insectivorous diet. The Olive-backed Tailorbird plays a significant role in the ecosystem by controlling insect populations, pollinating flowers, and dispersing seeds. Their foraging habits, primarily for insects and small arthropods, align them as important contributors to the biological diversity and health of their habitats. This bird's behaviors and ecological roles are consistent throughout the year, though slight variations in diet and nesting can occur with seasonal changes. During the breeding season, typically from March to July, their activity intensifies, focusing on courtship and nest-building. The Olive-backed Tailorbird's adaptability extends to its resilience against certain habitat changes, yet deforestation and habitat fragmentation pose significant threats. Conservation efforts are crucial to maintaining their populations, ensuring these birds continue to thrive in their native ranges.

The Olive-backed Tailorbird belongs to the family Cisticolidae, within the order Passeriformes. These birds typically live average 4-6 years with a maximum recorded of 8 years..

How to Identify a Olive-backed Tailorbird

The Olive-backed Tailorbird is a small bird, measuring about 12 cm in length, with a distinctive olive-green back that gives it its name. The underparts are a contrasting white or creamy color, while the head exhibits a rufous or chestnut crown, which is more pronounced in males. Juveniles tend to have a duller appearance, with less vibrant coloration and a more subdued crown. Females generally resemble males but may have slightly paler underparts. In the field, the Olive-backed Tailorbird can be confused with the Common Tailorbird (Orthotomus sutorius), yet the latter lacks the distinctive olive back, having more uniform green upperparts. The Olive-backed Tailorbird's flight is typically short and low, characterized by rapid wingbeats and a slightly undulating motion. When perched, it often flicks its tail, a behavior common among tailorbirds, aiding in its identification.

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Olive-backed Tailorbird Habitat and Range

Preferred Habitat

Olive-backed Tailorbirds inhabit a variety of dense, shrubby environments. They thrive in lowland forests and secondary growth areas up to elevations of about 1200 meters, adapting to both rural and urban settings. They are often found in gardens, plantations, and mangroves, indicating their adaptability to human-altered landscapes. In urban areas, they frequent parks and gardens where suitable shrubby cover is available. Seasonally, there is little shift in habitat preference, although breeding activities may drive them to seek denser areas for nest-building.

Geographic Range

The Olive-backed Tailorbird's range is primarily in Southeast Asia, with populations concentrated on the Indonesian islands of Java and Bali. They are non-migratory, remaining in their breeding territories year-round. While they do not undergo extensive migrations, local movements may occur in response to changes in food availability or habitat conditions. Java and Bali serve as population density hotspots, with the species being relatively common in suitable habitats across these islands.

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What Does the Olive-backed Tailorbird Eat?

The diet of the Olive-backed Tailorbird primarily consists of insects and tiny arthropods. They forage actively among leaves and branches, employing a mix of gleaning and snatching techniques to capture prey. Their diet varies seasonally, with an increase in fruit consumption during certain times of the year when insect abundance may decline. Typically, they focus on small prey items such as caterpillars, which are abundant in their habitats. Feeding occurs throughout the day, with peaks during the early morning and late afternoon when insects are most active and temperatures are moderate.

Olive-backed Tailorbird Behavior and Social Structure

Olive-backed Tailorbirds are known for their territorial and solitary nature, often seen alone or in pairs rather than in flocks. They display strong territorial behavior, especially during the breeding season, aggressively defending their territory from intruders. Courtship involves a series of calls and displays, where males present their colorful plumage to attract females. In terms of daily activity, these birds are diurnal, engaging in most of their foraging and social interactions during daylight hours. When faced with predators, they exhibit a combination of alarm calls and evasive flight, seeking dense cover to avoid capture.

Olive-backed Tailorbird Nesting and Reproduction

The Olive-backed Tailorbird constructs its nests by sewing leaves together using plant fibers, silk, or cotton. Nests are usually located in low shrubs or small trees, providing concealment and protection. A typical clutch consists of 2 to 4 eggs, with incubation lasting about 14 days. Both parents participate in feeding the young, which fledge approximately two weeks after hatching. This species generally produces two broods per year, depending on environmental conditions and food availability. Parental care extends beyond fledging, with parents often seen feeding and guiding their young.

Olive-backed Tailorbird Sounds and Vocalizations

The primary song of the Olive-backed Tailorbird is a rapid, high-pitched series of notes that can be described as a 'twee-twee-twee,' repeated frequently. This song is used mainly for territory establishment and courtship. Their call notes include sharp, metallic 'tik' sounds, often uttered in series when alarmed or communicating with a mate. During the dawn chorus, their vocalizations become more pronounced, contributing to the acoustic tapestry of their habitat.

Interesting Facts About the Olive-backed Tailorbird

1Olive-backed Tailorbirds are adept at nest-building, sewing leaves together to create secure nests.
2Their sewing technique involves using spider silk or plant fibers, showcasing impressive avian engineering.
3Despite their small size, they are highly territorial, often defending their space aggressively.
4The Olive-backed Tailorbird's diet can shift seasonally, incorporating more fruit during lean insect periods.
5Males can be distinguished by their more vibrant chestnut crowns compared to females.
6Their song, a rapid series of notes, serves as both a mating call and a territorial assertion.
7They can produce two broods per year, with both parents involved in chick rearing.

Olive-backed Tailorbird Conservation Status

The Olive-backed Tailorbird is currently listed as Least Concern by the IUCN, with stable population trends. However, habitat loss due to deforestation and agricultural expansion poses ongoing threats. Conservation efforts focus on habitat protection and restoration, ensuring the preservation of suitable environments. Historically, this species has maintained stable populations, benefitting from its adaptability to various habitats, both natural and altered.