Endangered Whales 

Whales are known for their massive size and beautiful songs, but these giants of the deep are quickly disappearing from Earth's oceans. Pollution, overfishing, and human disturbances have caused many whales to become endangered. Endangered Whales teaches readers about North Atlantic right whales, sei whales, blue whales, and gray whales, and how conservationists are pulling the species back from the brink of extinction.