books.google.ca - How does a chick get out of the egg? Why do pigs roll in the mud? Why do horses sleep standing up? Catherine Ripley (a.k.a. "The Answer Lady") is back with a new title in the popular Question and Answer Storybook series for young children. "Why Do Cows Moo?" is a wonderful collection of some of the most...http://books.google.ca/books/about/Why_Do_Cows_Moo.html?id=x3Asmukf62sC&utm_source=gb-gplus-shareWhy Do Cows Moo?