Animals belonging to suborder Odontoceti are a very diverse group of cetaceans with the common, distinctive feature of having teeth. General characteristics Odontocete have a single blowhole, whereas toothless cetaceans (suborder Mysticeti) have two blowholes. Males are larger than females and the sexual dimorphism is most extreme in the Sperm whale. All Odontocetes use echolocation - i.e. they are endowed with a natural sonar which allows them to detect prey and other objects at a distance or in conditions where vision is useless.