Yellow-rumped Flycatcher

The yellow-rumped flycatcher is a distinctive species with almost no look-alike other than the narcissus flycatcher. In all plumages the yellow rump is distinctive, and the male's white supercilium separates it from the narcissus and green-backed flycatchers. Females and first-year males are olive-grey above with a blackish tail. Some individuals with a yellow supercilium have been considered hybrids with the narcissus flycatcher. (Wikipedia, general species account)

Also known as the Korean or tricolor flycatcher, it breeds in eastern Asia, including parts of Mongolia, Transbaikal, southern China, Korea and western Japan, and winters in parts of the Malay Peninsula and South Asia. The species complex once included Elise's flycatcher, which is usually treated as a subspecies of the narcissus flycatcher. (Wikipedia, general species account)