tree swallow (Tachycineta bicolor)
A North American bird species; the name is used in ornithological contexts.
The tree swallow is a type of swallow commonly seen in North America.
Katakana spelling is common for bird names; usually written in kana.
Kanji spelling is rare; the word is usually written in kana.
Compound of 緑 (midori, 'green') and 燕 (tsubame, 'swallow'), referring to the bird's greenish upperparts.