The wings of the ostrich flap joyfully, but cannot match the pinions and feathers of the stork.
The ostrich is a wonderful animal, a very large bird, but it never flies. Some have called it a winged camel. God here gives an account of it, and observes, I. Something that it has in common with the peacock, that is, beautiful feathers (Job 39:13): Gavest thou proud wings unto the peacocks? so some read it. Fine feathers make proud birds.
Commenting on Job 39:13-18
Gavest thou the goodly wings unto the peacocks?.... Rather "ostriches", as the Vulgate Latin and Tigurine versions render it; some render it, "the wing of those that exult is joyful", so Montanus; that is, of the ostriches; who, in confidence of their wings, exult and glory over the horse and his rider, Job 39:18; for peacocks are not remarkable for their wings, but for their...
Rather, "the wing of the ostrich hen"--literally, "the crying bird"; as the Arab name for it means "song"; referring to its night cries (Job 30:29; Mic 1:8) vibrating joyously. "Is it not like the quill and feathers of the pious bird" (the stork)? [UMBREIT]. The vibrating, quivering wing, serving for sail and oar at once, is characteristic of the ostrich in full course.