Toothed or Baleen?

This nonfiction comparison introduces cetaceans, marine mammals divided into toothed and baleen groups. It distinguishes the groups by their breathing openings, dorsal fins, feeding methods, and use of echolocation. Dolphins and porpoises appear among the toothed whales, while baleen whales take in water and prey through large mouths. The book focuses on both the shared characteristics and differences between these whales.