Job 39:17

Understanding. This bird has a head disproportionately small; insomuch, that Heliogabalus served up the brains of 600 at one supper. It greedily eats iron, &c., which may help its digestion, as sand does that of other birds. (Calmet) --- When it is hunted, it hides its head only, as if this would be a sufficient defence, (Pliny, [Natural History?] x. 1.) and is taken alive by a man, clothed in the skin of an ostrich, who moves the head with his hand. (Strabo xvi.) --- All which proves its stupidity. (Calmet)