The Soul of an Octopus: A Surprising Exploration into the Wonder of Consciousness

by Sy Montgomery

an octopus is put together completely differently, with three hearts, a brain that wraps around its throat, and a covering of slime instead of hair. Even their blood is a different color from ours; it’s blue, because copper, not iron, carries its oxygen.

“Just about every animal,” Scott says—not just mammals and birds—“can learn, recognize individuals, and respond to empathy.”