What If? — A.H. Benjamin

When they find out a kangaroo is coming to stay, the barnyard animals at Buttercup Farm get very worried. They've never seen a kangaroo before. What if she crows better than Rooster, or catches more mice than Cat? Or gives creamier milk than Cow? Then they would all be out of jobs! But when she finally arrives, the animals learn what a kangaroo can really do.