Aquila o herodius? Alberto Magno interprete della Metafisica di Aristotele nel Prologo della Summa theologiae

In the Commentary on the Metaphysics, Albert the Great (d. 1280) envisages the pos- sibility that the human intellect relates to the highest realities not only as the eyes of the bat see the light of day (analogy used by Aristotle at the beginning of the second book of the Metaphysi- cs) but also – thanks to study and gradually, already in this life – as the eyes of the eagle see the circle of the Sun. In the Summa theologiae, discussing the same Aristotelian passage, Albert the Great replaces the eagle with the herodius (“golden eagle”, i.e. the eagle having supreme vision for Albert). The paper analyzes the meaning of this variation in Albertine ornithology, examining other passages of his works in which the herodius is mentioned and evaluating whether this is a sheer case of substitution of a species (the eagle) with one of its subspecies (the herodius) with the same meaning and function, or a subtle distinction between two different cognitive abilities required respectively by metaphysics and theology to know their objects of investigation.