Major Orders of Mammals:

• Subclass Eutheria (Placental mammals)
  • Order Artiodactyla (even-toed ungulates: antelope, deer, camels, pigs, cows, sheep, hippos, etc.)
  • Order Carnivora (carnivores: cats, bears [like the panda, polar bear, grizzly, etc.], weasels, pinnipeds, etc.)
  • Order Cetacea (whales, dolphins)
  • Order Chiroptera (bats)
  • Order Insectivora (insect-eaters: hedgehogs, moles, shrews)
  • Order Lagomorpha (rabbits, hares, pikas)
  • Order Macroscelidea (elephant shrews)
  • Order Perissodactyla (odd-toed ungulates: horses, rhinos, tapirs)
  • Order Pholidota (the pangolin)
  • Order Primates (apes, monkeys, lemurs, people)
  • Order Proboscidea (elephants, mammoths, mastodonts, etc.)
  • Order Rodentia (rodents: rats, mice, squirrels, gerbils, hamsters, etc.)
  • Order Sirenia (sea cows, manatees)
  • Order Tubulidentata (aardvarks)
  • Order Edentata [also called Xenarthra] (sloths, armadillos)
  • Order Hyracoidea (hyraxes)
  • Order Condylarthra (extinct)
  • Order Creodonta (an extinct group of carnivores)
  • Order Desmostylia (an extinct group of marine mammals)
  • Order Embrithopoda (extinct rhino-like animals)
• Subclass Metatheria (marsupials, about 270 species of mammals whose young are in an immature state, most females have pouches)
  • Order Didelphimorphia - opossums
  • Order Paucituberculata - shrew-like insectivores
  • Order Microbiotheria - only one living species, called "monito del monte" (Dromiciops australis)
  • Order Dasyuromorphia - numbat, extinct Tasmanian wolf
  • Order Peramelemorphia - bandicoots and bilbies
  • Order Notoryctemorphia - marsupial moles
  • Order Diprotodontia - (10 families and 117 species) kangaroos, wallaby, wombats, koalas
• Subclass Prototheria
  • Order Monotremata (2 families of mammals that lay eggs with leathery shells and nourish the young with milk from belly pores: Family Ornithorhynchidae, duck-billed platypus and Family Tachyglossidae, spiny anteaters)
• Multituberculata (extinct mammals with multi-cusped teeth)