"I feel more comfortable with gorillas than people. I can anticipate what a gorilla's going to do, and they're purely motivated."

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There are a lot of obstacles in the way of our understanding animal intelligence - not the least being that we can't even agree whether nonhuman species are conscious. We accept that chimps and dolphins experience awareness; we like to think dogs and cats do. But what about mice and newts? What about a fly? Is anything going on there at all?

— Jeffrey Kluger