How do dolphins sleep? Spark elementary-age readers' natural curiosity about ocean mammals with an inquiry-based nonfiction approach to dolphins. Did you know that a dolphin can put half its brain on sleep mode? The other half stays awake to remember to go up for air. Dolphins spend most of their lives holding their breath--almost two-thirds! With an engaging Q&A format, curious elementary kids will learn about this whale's family life, behavior, and what they do for fun. Simple infographics call out stats and support visual learning. A Stay Curious! feature models research skills and doubles as a mini media literacy lesson. Includes a table of contents, glossary, and index.