The characteristics that place the mammals in the class is that they are warm blooded animals. They have three middle bones,hair and the production of milk modified sweat glands called mammary glands. The three middle bones are called the malleus, incus, and stapes function in the transmission of vibrations from the tympanic membrane to the inner ear. Their hair has several functions, including insulation, color patterning, and the aiding in the simple touch. The female mammals produce milk from their mammary glands in order to nourish.
They have adapted to survive and to move around in their chosen habitat. As many need to find, food, shelter, and the breeding mates. They have to be able to quickly move through the environment before any of the carnivores try to get them. With the mammals in the ocean they have developed flippers instead of legs so they could glide and swim through the water to search for prey, and to make speedy escapes so the wont get preyed on.
The Order of division for mammals are Artiodactyla,Carnivora,Cetacea, chiroptera, Dermoptera, Edentata, Hyracoidae, Insectivora,Lagomorpha,Marsupialia,*Monotremata,Perissodactyla,Pholidata, Pinnipedia,Primates, Proboscidea,rodentia,Sirenia, Tubulidentata.
I choose the Family Monotremata, the Greek word "Monos" means single and "trema" means hole this mean mammals that lay eggs instead of giving birth to live animals like Marsupials and Placental mammals. The existing montreme species are the platypusand four species of the spiny anteaters. They are warm-blooded mammals with a high metabolic rate, have hair on their bodies, produce milk through mammary glands to feed their young, have a single bone in their lower jaw, and have a middle ear bone.
The genus I choose was the duck-billed platypus. Its a semiaquatic egg-laying mammals. Its is the only mammal that lay eggs instead of giving birth. It is one of the few venomous animals,the male platypus has a spur on the hind foot that delivers a very dangerous venom that could kill humans. The platypus is on a 20-cent coin in Australia, and its the emblem of the state of NewSouth Wales. Until the 20th century it was hunted for its fur, but now it is protected throughout its range.
Platypus (Ornithorhynchus anatinus)