DK Eyewitness Interactive CetaceansBack to: FREE! Introduction to Whales and Dolphins Online Unit StudyWhen navigating away from the below page, click the back button on your browser to return to this page. Previous LessonIntroduction to Whales & DolphinsIncludes a flipbook Slideshow about the Introduction to Whales and dolphins with a follow-up 5-question quiz from Quizlet. Next LessonWhale & Dolphin CharacteristicsThis lesson includes an introduction to the main whale, dolphin and porpoise physical characteristics. There is a National Geographic poster to zoom into of popularly known cetaceans. Lastly, there is an Interactive whale and dolphin song poster – click the sound clips and hear over ten different species of whales and dolphins.