Reading an octopus’s intentions is not like reading, for instance, a dog’s. I could read Sally’s feelings in a glance, even if the only part of her I could see was her tail, or one ear. But Sally was family, and in more than one sense. Dogs, like all placental mammals, share 90 percent of our genetic material. Dogs evolved with humans. Octavia and I were separated by half a billion years of evolution. We were as different as land from sea. Was it even possible for a human to understand the emotions of a creature as different from us as an octopus?
