Augustine of Hippo : When God announces the death of all animals on the earth and in the air, the intention is to declare the magnitude of the coming disaster. There is no question here of punishing with death irrational animals as though they were guilty of sin. — City of God 15.25 Bede : And touched by inner sorrow of the heart, He said, "I will blot out man whom I have created from the face of the earth, from man to animals, from creeping things to the birds of the sky; for I regret that I have made them." For God is said to grieve in a human manner when He considers that the men whom He created cling to a malicious enemy through sin rather than to Him by living piously, according to Solomon's statement: "A foolish son is a grief to his father" (Prov. 19:13). And again: "A foolish son is the anger of his father, and the grief of the mother who bore him" (Prov. 17:25). But that He also announces the destruction of all earthly and flying creatures expresses the magnitude of the coming disaster: for He threatens destruction to the irrational creatures as if they, too, had sinned. — Commentary on Genesis (Hexaemeron) Philo of Alexandria : (94) Why God, after having threatened to destroy mankind, says that he will also destroy all the beasts likewise; using the expression, "from man to beast, and from creeping things to flying creatures;" for how could irrational animals have committed sin? (#Genesis 6:7). This is the literal statement of the holy scripture, and it informs us that animals were not necessarily and in their primary cause created for their own sake, but for the sake of mankind and to act as the servants of men; and when the men were destroyed, it followed necessarily and naturally that they also should be destroyed with them, as soon as the men, for whose sake they had been made, had ceased to exist. But as to the hidden meaning conveyed by the statement, since man is a symbol for the intellect which exists in us, and animals for the outward sense, when the chief creature has first been depraved and corrupted by wickedness, all the outward sense also perishes with him, because he had no relics whatever of virtue, which is the cause of salvation. — QUESTIONS AND ANSWERS ON GENESIS, I