55 It will not be detrimental, therefore, to the course of our present argument, if we explain the art of that creature, and show that the prophet has not spoken without a purpose in using the parable (or similitude) of the creature. For as the partridge is a vainglorious creature, when it sees near at hand the nest of another partridge with young in it, and with the parent-bird away on the wing in quest of food, it imitates the cry of the other bird, and calls the young to itself; and they, taking it to be their own parent, run to it. And it delights itself proudly in the alien pullets as in its own. But when the real parent-bird returns, and calls them with its own familiar cry, the young recognise it, and forsake the deceiver, and betake themselves to the real parent. This thing, then, the prophet has adopted as a simile, applying it in a similar manner to Antichrist. For he will allure mankind to himself, wishing to gain possession of those who are not his own, and promising deliverance to all, while he is unable to save himself.
Source: The Antichrist (New Advent)