The compelling reason for me is the mirror test, and what you can infer from it. The tiniest bit of self-awareness lets you pass the mirror test, as toddlers de

The compelling reason for me is the mirror test, and what you can infer from it. The tiniest bit of self-awareness lets you pass the mirror test, as toddlers demonstrate. Apes pass, elephants pass, and magpies pass. Monkeys fail. What's different about monkeys? They have smaller, simpler brains. If a monkey by all appearances has no concept of self, an ant with 0.008% as many neurons assuredly doesn't.