(L. Mamma - Breast)
They are found in a variety of habitals. Their body is covered by hair, a unique feature of mammals. Some of them are adapted to fly or live in water. Presence of mammary glands is the most unique feature of mammals. They have two pairs of limbs adapted for walking, running , climbing, burrowing, swimming and flying. Their skin is glandular in nature, consisting of sweat glands. scent glands and sebaceous glands. Exoskeleton includes hrony epidermal horns, spines, scales , claws, nails , hooves and bony dermal plates. Teeth are thecodont, heterodont and diphyodont. External cars or pinnae are present. The heart is four chambered and pssess a left systematic arch . Mature RBCs are circular, biconcave and non nucleated. Mammals have a large brain when compared to other animals They show greatest intelligence among all animals. Theri kidneys are metanephric and are ureotelic. All are homeothermic, sexes are separate and fertilization in internal.
Examples : Oviparous - Ornithorhynchus (Platypus), Viviparous - Macropus (Kangaroo), Pteropus (flying fox), Macaca (Monkey), Canis(Dog) , Felis(Cat), Elephas (Elephant) , Equus (Horse), Delphinus (Common dolphin), Balaenoptera (Blue whale), Panthera tigris (Tiger), Panther leo (Lion), Homo sapiens (Human), Bos (Cattle).
