How is “on the wing” used?

In Planet Earth: A Celebration (2020), one line is: “They even drink on the wing.”

Which movie is “on the wing” from?

The clip at the top of this page is from Planet Earth: A Celebration (2020).

They even drink on the wing.

5 作品で登場 · 1 本目

flying

文語 · 6 本の映画に登場

オックスフォード映画の 57%
flying
They even drink on the wing.
Let every creature go for broke and sing Let's hear it in the herd and on the wing

定義：Oxford Advanced Learner's Dictionary 第 9 版