Taiwan Bush Warbler

Overview

The Taiwan bush warbler (Locustella alishanensis) is an Old World warbler in the family Locustellidae that is endemic to Taiwan. First recorded in 1917, it was formally described as a distinct species in 2000 based on its unique song and morphological differences from related species.

Identification

• Small bird approximately 14 cm long, with dull rufous-brown upperparts and a white belly.
• Distinctive song consisting of a repeated sequence of one monotone whistle followed by three or four clicks.
• Dull rufous-brown head with narrow dark tips on the crown and pale buff supercilium and eye-ring.
• Black beak that may show a pale lower mandible in winter, paired with pale pink feet.

Habitat

Endemic to Taiwan, this species breeds in mountains between 1,200 and 3,000 m above sea level, though occasionally found below 1,000 m. It inhabits deciduous and coniferous woodland with thick undergrowth of grasses, shrubs, or ferns, as well as grass and bamboo near the tree line, and tolerates habitats disturbed by humans.

Diet

The holotype specimen was found to have insects in its stomach, indicating an insectivorous diet. Specific foraging techniques are not detailed in the available records, though it resides in undergrowth and grassland.

Did you know?

Although first recorded in 1917, the species was not recognised as distinct until 2000, with the discovery that its song is highly distinctive and unlike the nasal or staccato songs of related warblers. A 2015 study also identified it as the sister taxon to the russet bush warbler species complex.