"“We did one study on cats—and that was enough!” Those words effectively ended my quest to understand the feline mind. I was a few months into writing Citizen Canine: Our Evolving Relationship With Cats and Dogs, which explores how pets are blurring the line between animal and person, and I was gearing up for a chapter on pet intelligence. I knew a lot had been written about dogs, and I assumed there must be at least a handful of studies on cats. But after weeks of scouring the scientific world for someone—anyone—who studied how cats think, all I was left with was this statement, laughed over the phone to me by one of the world’s top animal cognition experts, a Hungarian scientist named Ádám Miklósi."...