Deuteronomy 32:11 - Matthew Poole's English Annotations on the Holy Bible

Her nest, i.e. her young ones in the nest, by a common metonymy; which she by her cry and motion provoketh to fly by her example. Spreadeth abroad her wings, as preparing herself to fly. On her wings, or, as on her wings, i.e. gently, and tenderly, and safely too, as if she carried them not in her claws for fear of hurting them, but upon her wings. So it is only an ellipsis of the particle as, which is frequent, as hath been showed. Though some say the eagle doth usually carry her young ones upon her wings.