Climb aboard a very special ship with the Cat in the Hat to learn about the wonders of whales and porpoises and dolphins. Steered by Captain McElligot, the ship takes readers over and under the sea to explain the differences between fish and air-breathing mammals. The Cat also shows readers how to tell dolphins and porpoises apartand a chance to see if readers can spot the differences on their own. Beautifully detailed and labeled illustrations identify a wide variety of porpoise, dolphin, and whale species. The lively rhyming text keeps the information fun and easy to grasp for young readers. This book is full of interesting facts on these amazing sea mammalsand its also full of Dr. Seuss-style fun!