Are We Smart Enough to Know How Smart Animals Are?

What separates your mind from the mind of an animal? Maybe you think it's your ability to design tools, your sense of self, or your grasp of past and future - all traits that have helped us define ourselves as the pre-eminent species on Earth. But in recent decades, claims of human superiority have been eroded by a revolution in the study of animal cognition. Take the way octopuses use coconut she...