Aviva wants to upgrade the Tortuga with swimming capabilities, and so the Kratt brothers seek out a sea turtle for inspiration. Learning Goals: There are several classifications of turtle groups, and each have different characteristics depending on their environment. Animals Featured: Hawksbill turtle, dolphin, sea turtle, tiger shark Never Before or Rarely Seen Wildlife Moment: Inside view from sea sponge as it’s eaten by sea turtle, and hawksbill turtle defending itself from tiger shark.