She thought, 'How can he embrace me, after having produced me from himself? I shall hide myself.' She then became a cow, the other became a bull and embraced her, and hence cows were born. The one became a mare, the other a stallion; the one a male ass, the other a female ass. He embraced her, and hence one-hoofed animals were born. The one became a she-goat, the other a he-goat; the one became a ewe, the other a ram. He embraced her, and hence goats and sheep were born. And thus he created everything that exists in pairs, down to the ants.

In plain words: The wife thought it was wrong for him to unite with her, since she came from him, so she hid by turning into a cow. He became a bull, and cows were born. They kept changing into horses, donkeys, goats and sheep, and so every kind of creature that comes in pairs was made, down to the ants.