White-browed Tit-Warbler Leptopoecile sophiae

A tiny purplish-blue bird with a chestnut cap, a soft pink belly, and a pale brow that is not always prominent, and more often grayish than white. Lacks the pale head of Crested Tit-Warbler. Breeds in high-altitude forests and scrub, but descends into foothills in the winter. Usually seen singly, in small flocks, or as a part of mixed flocks. Gives high crisp-sounding notes, usually in pairs.