The Explorers are designed to engage all readers who are starting to read on their own, as well as more confident readers who are beginning to develop broader reading and cross-disciplinary skills. Vibrant and spectacular artwork captures children's interest in a topic, and each scene is followed by a photographic layout of information that provides a wealth of additional details. As a fun extra element, the reader can follow thematic links to gain information on related subjects. The book "Whales and Dolphins" is an adventure to swim with these amazing mammals: discover the largest animal on the planet, the mammal with the longest migration, and how dolphins sing and communicate with each other.