swiftlet
A type of bird that builds nests in caves, known for its edible nests used in bird's nest soup.
Swiftlet nests are known as a luxury food ingredient.
Katakana spelling is common for this bird name.
Kanji spelling is rare; the word is usually written in kana.
Compound of 穴 (ana, 'hole') and 燕 (tsubame, 'swallow'), referring to the bird's habit of nesting in caves.