Did you know that there are only two mammal species that do not give birth to live young? The platypus and the echidna hatch their young from eggs. Discover more fascinating facts in Mammals, a Life Cycles book. Each book in this series explores the various stages of development for a different group of animals. With detailed diagrams, informative infographics, and vibrant visuals, these books are sure to engage even the most reluctant readers. AV2 media enhanced.