Job 40:16

His strength is in his loins He hath strength answerable to his bulk, but he is of a mild disposition, and his strength, by God's wise and merciful providence, is not an offensive strength, consisting in, or put forth by, horns or claws, as it is in ravenous creatures, but only defensive, and seated in his loins. And his force is in the navel of his belly From hence Bochart argues that behemoth cannot be the elephant, as is generally supposed: because the strength of an elephant consists not in his belly; for though his hide on the back is very hard, yet on the belly it is soft. And therefore the rhinoceros, contending with him, aims chiefly at his paunch, knowing, as it were, that to be a soft place, and more capable of being injured. On the other hand, the description, he urges, agrees well with the hippopotamus, which is remarkable, both for the strength of his belly and navel, as well as other parts of his body; the skin being so firm and thick as to be almost impenetrable, and able to resist the force of spears and darts.