The Class Mammalia, which comprises of animals that nurse their young ones with milk and have hair or fur, can be referred to as the group of mammals. Another synonym for this class includes the Mammals, which are warm-blooded vertebrates with mammary glands and characteristic fur or hair. Additionally, the Class Mammalia can be referred to as the Theria, which comprises of marsupials and placental mammals. Other synonyms for this class include the mammalians, clade mammalia, mammaliaformes, and mammalian animals. These synonyms are commonly used in scientific and academic writing to refer to the Class Mammalia.