According to the author of the book of Job, God is talking about how He gave beautiful wings to birds like peacocks and ostriches. This shows that God designs everything in nature, and He decides what each creature looks like.
Job 39:13: [Gavest thou] the goodly wings unto the peacocks? or wings and feathers unto the ostrich? [wings and...: or, the feathers of the stork and ostrich]
Job 39:13 describes the beauty and pride of the peacock’s wings, while Proverbs 28:5 states that evil men do not understand judgment, indirectly implying a lack of wisdom behind mere physical beauty.
Proverbs 28:5: Evil men understand not judgment: but they that seek the LORD understand all [things].