Каштановобрюхая синица Sittiparus castaneoventris

Very small endemic songbird, with black throat and cap, white cheek, steely gray upperparts, and vivid chestnut underparts. No similar bird found in Taiwan. Inhabits forests, parks, and gardens, primarily in foothill and montane areas, where it often forages in flocks, sometimes with other species. Calls include high twittering notes and nasal notes.