Sunda Thrush

Tentang

The Sunda Thrush, locally known as Murai Batu Larwo in some regions, is a medium-sized thrush found in montane forests of Southeast Asia. It is characterized by its dark plumage with a distinctive scaly pattern on its underparts and a prominent white eye-ring. It is a shy and elusive bird, often foraging on the forest floor.

Ukuran dan masa hidup

Panjang

23-27 cm

Bentang sayap

38-42 cm

Berat

70-90 g

Masa hidup

5-8 years in the wild (estimated)

Makanan

Omnivore (primarily insectivore)

Ciri fisik

Bulu

Adults are predominantly dark brown to blackish-brown on the upperparts, including the crown, nape, mantle, back, and wings. The underparts are paler, typically buffy-white to pale rufous, heavily scaled with dark brown or blackish crescent-shaped markings, giving a 'scaly' appearance. The throat is often whitish with fine dark streaks. The undertail coverts are usually plain buff or rufous. A prominent white eye-ring is a key field mark.

Bentuk paruh

Moderately long, slender, and slightly decurved; dark horn-colored to blackish.

Warna mata

Dark brown.

Warna kaki

Pinkish-brown to dark brown.

Ciri pembeda

Prominent white eye-ring, dark upperparts contrasting with scaly underparts, and a relatively upright posture when foraging on the ground.

Penampilan muda

Juveniles resemble adults but may have a slightly duller plumage, with less distinct scaling on the underparts and sometimes faint buff spotting on the upperparts, particularly on the wing coverts.

Perubahan musiman

No significant seasonal plumage changes are noted for this species.

Dimorfisme seksual

Males and females are generally similar in plumage, with no significant sexual dimorphism observed.

Cara identifikasi

1. 1

   Plumage Coloration

   Look for dark blackish-brown upperparts contrasting with paler, heavily scaled underparts. The scaling is typically bold and crescent-shaped.

2. 2

   Eye-ring

   A distinct, unbroken white eye-ring is a crucial field mark that helps distinguish it from similar thrushes.

3. 3

   Habitat and Behavior

   Observe its preference for dense montane forest undergrowth and its habit of foraging on the forest floor, often flicking leaves. Its shy nature means it's often heard before seen.

4. 4

   Vocalization

   Listen for its characteristic clear, fluty, and melancholic whistling song, often delivered from a hidden perch.

Habitat dan persebaran

Bioma

Tropical and subtropical moist montane forests.

Persebaran geografis

Found in the Greater Sunda Islands (Sumatra, Java, Bali, Lombok, Sumbawa, Flores, Timor) and parts of the Malay Peninsula (southern Thailand, Peninsular Malaysia).

Rentang ketinggian

Typically found at elevations between 900 and 2,500 meters above sea level, occasionally lower or higher depending on the specific island and local conditions.

Lingkungan yang disukai

Dense undergrowth of montane rainforests, often near ravines, streams, or mossy areas. Prefers areas with a thick leaf litter layer for foraging.

Perilaku

Waktu aktivitas

Diurnal, most active during early morning and late afternoon.

Kebiasaan makan

Primarily forages on the forest floor, meticulously sifting through leaf litter and moss for invertebrates. Diet includes insects (beetles, ants, termites), earthworms, snails, and occasionally small fruits or berries. It uses its bill to flick leaves and probe the soil.

Perilaku sosial

Generally solitary or found in pairs, especially during the breeding season. It is a shy and secretive bird, often difficult to observe.

Pola terbang

Flight is typically short, low, and direct, often from one patch of dense cover to another. It is not known for long-distance flights within its habitat.

Pola migrasi

Resident species; no significant migratory movements are known. May undertake local altitudinal movements in response to food availability or weather conditions.

Teritorialitas

Likely territorial, especially during the breeding season, defending a nesting and foraging area, though specific details are not well-documented.

Reproduksi

Musim kawin

Varies geographically, but generally between March and August, coinciding with the rainy season and increased insect availability.

Kebiasaan bersarang

Nests are typically cup-shaped, constructed from moss, twigs, rootlets, and leaves, often lined with finer materials. They are usually placed low in dense undergrowth, on a fern, or in a small tree fork, well-concealed.

Jumlah telur

2-3 eggs.

Deskripsi telur

Eggs are typically pale blue or greenish-blue, often speckled or blotched with reddish-brown or purplish markings, particularly at the larger end. Clutch size is usually 2-3 eggs.

Masa inkubasi

Approximately 14-16 days (estimated, specific data for this species is limited).

Masa terbang

Approximately 14-18 days after hatching (estimated).

Perawatan orang tua

Both parents are believed to participate in incubation and raising the young, though specific roles are not extensively documented.

Di mana ditemukan

Tips lapangan

1. Patience and Stealth. This is a very shy and elusive bird. Remain still and quiet for extended periods in suitable habitat. Movement and noise will likely scare it away.
2. Listen for Calls. Its distinctive song and calls are often the first indication of its presence. Learn to recognize its vocalizations to locate it.
3. Scan the Forest Floor. Since it primarily forages on the ground, pay close attention to areas with leaf litter, moss, and fallen logs. Look for subtle movements or flicking leaves.
4. Use Binoculars. Good quality binoculars are essential for observing details like the eye-ring and plumage patterns in the often dim light of the forest understory.
5. Go at Dawn or Dusk. Activity levels are generally higher during these times, increasing your chances of an encounter.

Spesies serupa

Fakta singkat

Common Name:

Sunda Thrush (Murai Batu Larwo)

Scientific Name:

Zoothera andromedae

Family:

Turdidae

Habitat:

Montane rainforests

Diet:

Insects, earthworms, snails, some fruit

Conservation Status:

Least Concern

Key ID Feature:

White eye-ring, scaly underparts

Fakta menarik

• The name 'Murai Batu Larwo' is a local Indonesian name, with 'Murai Batu' often referring to magpie-robins, but in this context, it's used for a thrush, highlighting its dark coloration and perhaps some perceived similarity in behavior or song quality by local observers.
• Despite its relatively wide distribution across the Sunda Islands, its secretive nature and preference for dense montane habitats make it a challenging bird to observe and study in detail.
• The genus Zoothera is known for its 'ground-thrushes,' many of which exhibit similar scaly plumage patterns, providing excellent camouflage on the forest floor.

Klasifikasi ilmiah

Kerajaan

Animalia

Filum

Chordata

Kelas

Aves

Ordo

Passeriformes

Famili

Turdidae

Genus

Zoothera

Spesies

Z. andromedae

Jelajahi Sunda Thrush