The ability to recognize oneself in the mirror is often viewed in absolute terms. According to Gallup, the pioneer of this field, a species either passes the mirror mark test and is self-aware, or it doesn’t and isn’t.9 Very few species do. For the longest time, only humans and the great apes passed, and not even all those. Gorillas used to flunk the mark test, leading to theories about why the poor things might have lost their self-awareness.
