John Trapp on Job 39:30

Verſe 30. Her young ones alſo ſuck up blood] Heb. They glut-glut blood; the Hebrew word, jegnalegna dam, ſeemes to be made from the ſound in ſucking. The young Eagles, not yet able to tear the prey brought unto them by the old one with their talons, ſuck the blood with their Beak, and ſo are fleſht in blood betimes.

And where the ſlain are, there is ſhe] This is true of all the kinds of Eagles, but eſpecially of the Vulturine Eagle, which is of a very ſharp ſmell as well as ſight, and by a ſtrange ſagacity of nature, reſorteth with her young to places of ſlaughter and bloodſhed; ſhe followeth Armies, and feedeth on carcaſſes, which they can ſmell, ſay ſome Naturaliſts, before the battle be fought. And can this be of any one but the Lord. Our Saviour alludeth to this Text, Mat, 24.28. Where the carcaſſe is, there will the Eagles be alſo. See my Note on that place.