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Luzon island thrush
Conservation status
Not evaluated (IUCN 3.1)
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Aves
Order:	Passeriformes
Family:	Turdidae
Genus:	Turdus
Species:	T. thomassoni
Binomial name
Turdus thomassoni (Seebohm, 1894)

Luzon island thrush (Turdus thomassoni) is a species of passerine in the family Turdidae. It is endemic to the island of Luzon in the Philippines. It was formerly considered to be two separate subspecies of Island thrush until 2024 when it was classified as a distinct species by the IOC and Clements checklist.

Description and taxonomy

EBird describes this as "Dark thrush of montane forests above 1000 meters, endemic to the Philippine island of Luzon. Not strikingly patterned; black with a dark brown head. Also note bright orange bill, eyering, legs, and feet. Forages at all levels of forest, picking fruit from the canopy and flipping leaves for insects on the forest floor. Song is repetitive but lovely, consisting of warbles and trills. Gives low chup notes and explosive rattling series, especially when alarmed."

This species is sexually dimorphic. The male Luzon island thrush is glossy back with a dark brownish gray hood on head and upper breast and white streaks in vent. The female is duller and more uniform dark with slight rufous underparts and a lighter vent.

The Luzon island thrush was first described as Merula thomassoni by ornithologist Henry Seebohm in 1894. In 1907, the subspecies T. t. mayonensis was described as Merula mayonensis by ornithologist Edgar Alexander Mearns, its binomial name being a reference to the mountain where it was first collected, Mount Mayon. Both were later considered to be subspecies of Island thrush as T. p. thomassoni and T. p. mayonensis. In 2024 the two subspecies were classified as one distinct species based on morphological and phylogenic evidence following a 2023 study and based on this, it is the second most divergent taxon in the species complex after the Mindoro island thrush.

Subspecies

Two subspecies are recognized:

• T. t. thomassoni (Seebohm, 1894) - Mountains of northern Luzon
• T. t. mayonensis (Mearns, 1907) - Mountains of southern Luzon

Ecology and behavior

This is a newly split species and there are no specific studies yet for the Luzon island thrush. The island thrush has a varied and generalist diet taking a range of invertebrates such as insects including beetles, spiders, snails, earthworms, as well as carrion and even small reptiles. It will also take fruit and seeds, depending on what is locally available. It is observed foraging on leaf litter and low branches in dense cover, clearings and even roads.

The only specific information known about the Luzon island thrush is that it has been observed feeding on berries.

Breeding season is believed to be April to May but birds with enlarged gonads have been collected from February to October. The Island thrush species complex makes cup shaped nests of grass, roots, tendrils, twigs, bark and moss. These nests are typically placed low and close to a clearing. Clutch size is 1 to 3 eggs but is usually 2. Eggs are greenish blue with brown spots. Incubation takes 18 days and fledgling takes 17 to 19 days.

Habitat and Conservation status

It occurs in tropical moist montane forest and forest edges above altitudes of 1,000 m.

This is a newly split species and has yet to be assessed by the International Union for Conservation of Nature. This bird is believed to be common in its habitat. However, like all other forest species in the Philippines, its population is still likely on the decline. This species' main threat is habitat loss due to deforestation through mining, logging and conversion of habitat into farmland. Mossy forests of the Cordillera Central are threatened by conversion to agricultural land, primarily for vegetable production. Forest cover in the Sierra Madre has declined by 83% since the 1930s.

It occurs in a few protected areas like Mount Pulag National Park, Mount Polis, Mounts Banahaw–San Cristobal Protected Landscape, Mount Isarog, Mount Mayon, Mount Bulusan.

References

1. "2024 Taxonomy Update—COMING SOON". eBird. Retrieved 20 October 2024.
2. "Proposed Splits/Lumps". IOC World Bird List v14.2. Retrieved 20 October 2024.
3. "Luzon Island-Thrush - eBird". ebird.org. Retrieved 2024-10-23.
4. Seebohm, Henry (1894). "MERULA THOMASSONI, Sp. 1". Bulletin of the British Ornithologists' Club (3): 51. Retrieved 20 October 2024.
5. Reeve, Andrew Hart; Gower, Graham; Pujolar, José Martín; Smith, Brian Tilston (January 2023). "Population genomics of the island thrush elucidates one of earth's great archipelagic radiations". Evolution Letters. 7 (1). Retrieved 20 October 2024.
6. Gill, Frank; Donsker, David; Rasmussen, Pamela, eds. (August 2024). "Thrushes". IOC World Bird List Version 14.2. International Ornithologists' Union. Retrieved 26 September 2024.
7. Collar, Nigel; Christie, David; Kirwan, Guy M. (2024). "Luzon Island-Thrush (Turdus thomassoni), version 1.0". Birds of the World. doi:10.2173/bow.islthr36.01. ISSN 2771-3105.
8. "Luzon Island-Thrush". Avibase. Retrieved 20 October 2024.

External links

• Data related to Turdus thomassoni at Wikispecies

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