Jerome

After forty days, Noah opened the door of the ark which he had made, and released a raven, but it did not return to him until the waters had dried up from the earth. As for the dove, it is said differently: He released a raven, and it went out, going and coming back until the waters had dried up from the earth.

Hebrew Questions on Genesis ↗

Bede

And when forty days had passed, Noah opened the window of the ark, which he had made, and sent out a raven, etc. We have spoken above about the window of the ark, which, after the flood has subsided, is opened, indicating the secret mysteries of the heavens, to which those baptized are especially initiated; but with these same sacraments some are led to the allurements of the world, others to works of piety; and these indeed are represented by the raven, those by the dove. …

Commentary on Genesis (Hexaemeron) ↗