One place you absolutely, positively do not want to be if you're a healthy, middle-aged American lobster: trapped in a suburban grocery store in western Pennsylvania. But that's where this week's podcast begins.

It doesn't stay there long, though. Bonnie Hazen and Toni Leone take us on an adventure that carries us by car, by plane and by boat toward a deeper understanding of those mysterious protective feelings that sometimes sweep over us—well, some of us—when we encounter our fellow animals. Um, okay, some of them. Trevor Corson, author of the bestselling The Secret Life of Lobsters, assists.