All mammals share certain characteristics that set them apart from animal classes. But some mammals live on land and other mammals spend their lives in water–each is adapted to its environment. Land mammals breathe oxygen through nostrils but some marine mammals breathe through blowholes. Compare and contrast mammals that live on land to those that live in the water. This nonfiction picture book with a cuddle factor includes a 4-page For Creative Minds section in the back of the book and a 67-page cross-curricular Teaching Activity Guide online. Mammals is vetted by experts and designed to encourage parental engagement. Its extensive back matter helps teachers with time-saving lesson ideas, provides extensions for science, math, and social studies units, and uses inquiry-based learning to help build critical thinking skills in young readers. The Spanish translation supports ELL and dual-language programs. The interactive ebook reads aloud in both English and Spanish with word highlighting and audio speed control to promote oral language skills, fluency, pronunciation, text engagement, and reading comprehension. Tap animals and other things that make noise to hear their sounds.