Explorers are designed to appeal to all readers who are just starting to read alone and more confident readers who are beginning to exercise wider reading and cross-referencing skills. Lively, dramatic artwork scenes draw children into a subject, and each scene is followed by a photographic information spread that gives a wealth of extra detail. As a fun extra element, the reader can follow themed links to access information on related topics. Whales and Dolphins is an adventure to swim with these amazing mammals: find out the largest animal on Earth, the mammal with the longest migration, and how dolphins sing and call to each other.