An underground lair… what child didn’t daydream about it? As a child, I spent several summer holidays with friends constructing one. Granted, we didn’t really burrow, we dug a pit and put a roof back over it. Even so, if I am to believe Anthony J. Martin, I am but one in a long line of burrowing animals. With The Evolution Underground, Martin paints a surprising picture of the underrated role that burrowing has played throughout evolutionary history.