Cetaceans are divided into two groups: Mysticeti (Mysticeti), which have baleen to filter their food, like the humpback whale and the blue whale; and the Odontocetes (Odontoceti), known as the toothed cetaceans, among them are the dolphins, killer whales and sperm whales. Characteristics and adaptations of cetaceans Cetaceans evolved fifty million years ago from…
