“…This also applies within particular groups of living beings, as Aristotle claims a few lines earlier when he states that viviparous quadrupeds a taxonomic designation very close to the modern definition of mammals (Zucker 2005) show very similar, if not identical, anatomical traits to those of humans ( keimena hmois ; Arist., HA 2.15, 505b32-34). This is, indeed, what Aristotle says about the lungs in his study of the functions of and reasons for the existence of each organ and their mutual relations in the anatomy of a living being.…”