Todos los mami feros tienen ciertas caracteri sticas que los hacen diferentes de otros tipos de animales. Pero algunos mami feros viven sobre tierra firme y otros, viven en el agua--cada uno se adapta a su medio ambiente. Los mami feros que viven sobre la tierra firme pueden respirar el aire a traves de la nari z, mientras que los mami feros que viven dentro del agua pueden respirar mediante un orificio nasal. Explora las caracteri sticas que definen a ambos mami feros y compara y contrasta como se manifiestan estas caracteri sticas en los mami feros terrestres y en los mami feros acua ticos. Yes, Hall does hit on all the characteristics that make an animal a mammal, but these facts are presented in a way that allows children to compare and contrast various mammal species. --Kirkus Reviews This book is packed with information written in easy-to-understand language that is perfect for preschoolers and kindergarteners. It talks about the important features that make an animal a mammal: breathing air, having a spine, being warm blooded, having hair or fur, giving birth to live babies, and more. --San Francisco Book Review Filled with stunning action color photos of different mammals to teach common characteristics of mammals, such as a spine that connects all the way from the skull to the tail. --Midwest Book Review Award-winning author Katharine Hall is a life-long nature lover and avid reader. She hopes the Compare and Contrast series will help children use critical thinking skills to explore and learn about the natural world around them. In addition to Mammals, Katharine's other titles in this series include Polar Bears and Penguins (NSTA/CBC Outstanding Science Trade Book and IRA Children's and Young Adults' Book Award for Primary Non-Fiction), Amphibians and Reptiles, Clouds, and Trees. Katharine and her husband live in South Carolina with their dogs and cats.