J.R. stands for Junior, a particularly winsome little porcupine whom the young narrator of the story adopts. No bigger than a kitten, J.R. has nonetheless extreme ingenuity when it comes to turning the entire household upside down. A morning in his life includes such antics as getting into a flower bowl, peeling an onion and scaling the electric range. ""Get that animal out of this house,"" becomes the family cry. So, J.R. leaves, but not for long. By the authors of Common Wild Animals and Their Young, this book is generously illustrated with photographs which will turn even the most indifferent animal fancier into a porcupine enthusiast.