Phylloscopus schwarzi (Radde, 1863)

Taxonomy and Size

Radde's warbler, with the scientific name Phylloscopus schwarzi (Radde, 1863), is a warbler that is similar in size to the willow warbler.

Adult Plumage (Upperparts and Underparts)

Adult individuals have an unstreaked brown back and buff-colored underparts.

Head Markings

They have a very long, prominent whitish supercilium.

Bill Structure

Their pointed bill is thicker than that of the similar dusky warbler.

Leg and Foot Morphology

Their legs are paler than the dusky warbler's legs, and their feet appear large, which reflects this warbler's more terrestrial lifestyle.

Sexual Dimorphism

As with most warblers, the sexes of Radde's warbler are identical in appearance.

Juvenile Plumage

Young birds, however, are yellower on their underparts.

Vocalization

The call of this species is a soft chick.

Migratory Status

This species is migratory.

Breeding Range

It breeds in southern parts of Central and Eastern Siberia, ranging as far east as Korea and Manchuria.

Wintering Range

It spends the winter in Bangladesh, Cambodia, Laos, Myanmar and Thailand.

Breeding Habitat

Within its breeding range, Radde's warbler occurs in open deciduous woodlands with some undergrowth, as well as at bushy woodland margins, often located near water.

Wintering Habitat

In its wintering grounds, it occupies forest fringes, thick scrub, and bushy areas near woodland.

Diet

Like most Old World warblers, this small passerine bird is insectivorous.