eastern bluebird
Refers specifically to the eastern bluebird (Sialia sialis), a North American thrush. In Japanese, the name is often written in katakana as ルリツグミ.
The eastern bluebird is a beautiful blue bird that lives in North America.
Kanji spelling is rare and mainly encountered in specialized contexts; it but marks the word is listed as usually written in kana.
The name ルリツグミ combines 瑠璃 (ruri, 'lapis lazuli') referring to the bird's blue color, and 鶇 (tsugumi, 'thrush'). The exact derivation is uncertain, but it follows a common pattern for naming blue-colored thrushes.