In Other Animals
Primitive fossil amphibians had little, if any, shaft connecting the upper and lower extremities, making their limbs very short. In most living vertebrates, however, the humerus has a similar form to that of humans. In many reptiles and some primitive mammals, the lower extremity includes a large foramen, or opening, into which nerves and blood vessels pass.
Read more about this topic: Humerus
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“Of all animals the boy is the most unmanageable, inasmuch as he has the fountain of reason in him not yet regulated.”
—Plato (c. 427347 B.C.)