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.