Order Artiodactyla
Antelope, Giraffe & Pigs
Order Carnivora
Order Cetacea
Whales, Dolphins & Porpoises
Order Chiroptera
Order Dasyuromorphia
Australasian carnivorous marsupials
Order Dermoptera
Flying Lemurs
Order Edentata
Anteaters, Armadillos & Sloths
Order Hyracoidea
Order Insectivora
Order Lagomorpha
Rabbits & Pikas
Order Macroscelidea
Elephant Shrews
Order Marsupialia
Order Monotremata
Platypus & Echidnas
Order Perissodactyla
Horses, Rhinos & Tapirs
Order Pholidota
Order Primates
Order Proboscidea
Order Rhynchocephalia
Order Rodentia
Order Scandentia
Tree Shrews
Order Sirenia
Dugongs & Manatees
Order Tubulidentata

There are about 4500 living species of class Mammalia, to which we belong. Mammals are homeotherms (warm-blooded), with some species better at it than others. They have a four-chambered heart with complete double circulation; that is, the aerated blood of the arteries does not mix with the oxygen-depleted blood of the veins. The skin of most mammals is covered with hair at some stage of life. Mammals nourish their young with milk secretions produced in mammary glands of the mother. The fertilized egg develops inside the female; in most mammals, a special organ, the placenta, nourishes the developing embryo. Mammals have complex and differentiated teeth.

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Database Last Updated: 15 Apr 2010

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