noun
olive-backed pipit; Indian tree pipit
A small migratory songbird (Anthus hodgsoni) found in East Asia. The name is usually written in katakana.
春になると、ビンズイが公園でさえずり始める。
In spring, olive-backed pipits start singing in the park.
ビンズイは日本で繁殖する数少ないタヒバリの仲間だ。
The olive-backed pipit is one of the few pipit species that breed in Japan.
タヒバリ (Anthus rubescens) is a different pipit species; ビンズイ is specifically the olive-backed pipit.
The name ビンズイ is of uncertain origin; the kanji 便追 are ateji.