Animals are unchanging.
 The animals were then arranged on a scale from man (with blood, 2 legs, rational soul) down through the live-bearing tetrapods (with blood, 4 legs, sensitive soul) and other groups such as crustaceans (no blood, many legs, sensitive soul) down to spontaneously generating creatures like sponges (no blood, no legs, vegetable soul)
) what this "conceit" refers to is the fact that for the unenlightened man, all experience and action must necessarily appear phenomenologically as happening to or originating from an "I"

