Albert Barnes' Notes on the Whole Bible - Job 39:17
Because God hath deprived her of wisdom ... - That is, he has not imparted to her the wisdom which has been conferred on other animals. The meaning is, that all this remarkable arrangement, which distinguished the ostrich so much from other animals was to be traced to God. It was not the result of chance; it could not be pretended that it was by a human arrangement, but it was the result of divine appointment. Even in this apparent destitution of wisdom, there were reasons which had led to this... read more
The Pulpit Commentary - Job 39:18
What time she lifteth up herself on high, she scorneth the horse and his rider . The ostrich sometimes tries to elude pursuit by crouching and hiding behind hillocks or in hollows, making itself as little conspicuous as possible; but, when these attempts fail, and it starts off to run in the open, then it "lifts itself up" to its full elevation, beats the air with its wings, and scours along at a pace that no horse can equal. The Greeks with Xenophon, though well mounted, failed to catch a... read more