One rainy day Book

Why is Pig all wet? Did he get caught in the rain? No, he found shelter under a great big tree. But then a mouse joined him, and then two porcupines, three buffaloes, and so on, until there were enough animals under that tree to fill a zoo! But there was room for everyone, so why is Pig dripping wet? Goat thinks he knows . . . but young readers will be tickled to find out that the answer is not what they expect! By the creator of Where Is the Apple Pie?