Wingpit

The best character for prairie falcon is the overall paler color and the contrasting dark axillaries, the " wingpit."

Source: wiktionary

With black, pick up and knit 9 sts from shoulder to “wingpit” by picking up in one half of each edge st every other row. Turn body over and pick up 9 sts from wingpit to shoulder on the other side—18 sts.

Source: wiktionary

He gets such a kick out of his victory, that his foot gets stuck inadvertently in his wingpit. “There it is, written in black and white—printed, no less!” On account of his still-stuck foot, Owl relishes his triumph in a precarious balance on a branch.

Source: wiktionary