“Everybody asks, once you’ve been working on a book for a while, ‘Well aren’t you tired of it?’” Courage told Salon. “And I’m like ‘No, I could never actually be tired of talking about octopuses or learning about them.’”

Courage spoke to Salon about her boundless enthusiasm for the cephalopods and some of the many things humans can learn from them, along with some mysteries that seem as if they may never be solved. This interview has been edited for length and clarity.

Here’s the question I’m sure you get all the time: Why the octopus?

My obsession really started a few years ago. There was a study that came out that showed them using coconut shell halves as tools, and there was video, so I blogged about it for Scientific American. I was a reporter at the time, and ever since then I’ve just been totally fascinated, because it’s just amazing. They’re these crazy invertebrates that are using tools somehow — they’re not social, so how are they figuring this out individually? It’s pretty remarkable.

You still blog about octopuses for Scientific American. What kind of responses do you get? Is there more interest than you would have thought?

Yes! I mean, I always kind of thought that they were really fascinating, and then once I started working on the book I was totally blown away — and still, even after having written a book I learn something new every day, and it’s incredibly amazing. But anyway, people just come out of the woodwork to say they’re so excited because they just love octopuses, it’s their favorite animal, they’ve loved them forever… it’s just really cool that everybody seems to have a secret fascination with or obsession with octopuses.