The entries in the Endangered Animals series (6 titles) promise to spark curiosity as they inform readers about creatures that need our protection. Each book explains what it means to be an endangered species and features a chart for classifying an animal's status, from "least concern" to "vulnerable" ("high risk of extinction in the wild") to "critically endangered" ("extremely high risk of extinction in the wild") to extinct. The books' highly visual design utilizes colorful text, clear photos showcasing the animals, a small map pinpointing where they live, and a fast-facts box. Each volume examines a particular habitat, highlighting five at-risk animals from around the globe that call it home. Endangered Animals in the Sea swims alongside critically endangered hawksbill turtles, angel sharks, and bluefin tuna. The causes for each animal's threatened status are given when possible, ranging from climate change to habitat loss to pollution and other human activities. Concluding sections include animal "Success Stories" and "Save the Animals!" tips.