Taiwan bush warbler

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Taiwan bush warbler (Locustella alishanensis) is a small bird found only in Taiwan. It lives in mountain forests with thick ground cover from about 1,200 to 3,000 meters above sea level, and sometimes in disturbed areas near the tree line. It is about 14 cm long and weighs around 10 g. Males and females look alike: dull reddish-brown on top, white throat, grey-brown upper chest, and white belly. Juveniles have a brownish breast and no spots.

The species does not migrate, but it may move to lower elevations in winter. It breeds in May to June (possibly into August). The nest is built in grass and two eggs are laid per clutch. One studied specimen contained insects, showing its diet.

Taxonomy: The bird was first recorded in 1917 from Alishan and described as a separate species in 2000. It was initially placed in Bradypterus, then moved to Locustella. A 2015 genetic study showed it is closely related to the russet bush warbler group but is more genetically distinct.

Song and calls: Its song is a repeating sequence of one monotone whistle followed by three or four clicks, usually repeated many times and ending with a whistle. Calls include a scratchy sound, a sharp tick and a stip.

Conservation: It is common and not considered threatened. The IUCN lists it as Least Concern.