noun
red-flanked bluetail
A small passerine bird (Tarsiger cyanurus) native to Asia; the male has blue upperparts and orange flanks.
冬になると、ルリビタキが庭にやって来る。
In winter, red-flanked bluetails come to the garden.
From 瑠璃 (ruri, 'lapis lazuli') + 鶲 (hitaki, 'flycatcher'), referring to the bird's blue coloration.