Mammals are warm-blooded animals who suckle their young.  They can be further classified into sub-classes based on their reproduction as shown below.  There are changes and differences in the orders some families are listed as belonging depending on the source. I have chosen the taxonomy from iNaturalist as that seems to be the most up-to-date but have excluded superorders.  The orders seem to mostly agree with those in the CoL and BOLD listings.  The orders listed in the NBN Atlas appear to be an older system. I have listed the orders and families alphabetically.   I will link to the orders where I have examples and have put a * against the family.

Subclass Prototheria — Prototherians

Most of the animals in this group are extinct but there is one order with two families containing living species

• Order Monotremata (egg-laying mammals)
  Show Families

  • Family Ornithorhynchidae (platypuses)
  • Family Tachyglossidae (echidnas, also called spiny anteaters)

Subclass Theiria — Therians

These are animals that give live births and includes both the placental and marsupial animals.

Infraclass Marsupialia — Marsupials

• Order Dasyuromorphia — Carnivorous Marsupials
  Show Families

  • Family Dasyuridae (Dasyurens)
  • Family Myrmecobiidae (Numbats)
• Order Didelphimorphia — Opossums
  Show Families

  • Family Didelphidae (Opossums)
• Order Diprotodontia — Kangaroos, Possums, Wombats, and Allies
  Show Families

  • Family Acrobatidae (Feathertails)
  • Family Burramyidae (Pygmy Possums)
  • Family Hypsiprymnodontidae (Musky Rat-Kangaroos)
  • Family Macropodidae (Kangaroo, Wallabies, and Allies)
  • Family Petauridae (Gliders, Trioks, and Allies)
  • Family Phalangeridae (Cuscuses and Brushtail Possums)
  • Family Phascolarctidae (Koalas)
  • Family Potoroidae (Potoroos and Bettongs)
  • Family Pseudocheiridae (Ringtail Possums)
  • Family Tarsipedidae (Honey Possums)
  • Family Vombatidae (Wombats)
• Order Microbiotheria — Microbiotheres
  Show Families

  • Family Microbiotheriidae (Monitos del Monte)
• Order Notoryctemorphia — Marsupial Moles
  Show Families

  • Family Notoryctidae (Marsupial Moles)
• Order Paucituberculata — Shrew Opossums
  Show Families

  • Family Caenolestidae (Shrew Opossums)
• Order Peramelemorphia — Bandicoots and Bilbies
  Show Families

  • Family Peramelidae (Bandicoots)
  • Family Thylacomyidae (Bilbies)

Infraclass Placentalia — Placental Mammals

1. Order Afrosoricida — Golden Moles and Tenrecs
   Show Families

   1. Family Chrysochloridae (golden moles)
   2. Family Tenrecidae (tenrecs)
2. Order Artiodactyla — Even-toed Ungulates and Cetaceans
   Show Families

   1. Family Antilocapridae – ruminate (pronghorn antelope) *
   2. Family Bovidae – ruminate (cattle, bison, yaks, waterbucks, wildebeest, gazelles, springboks, sheep, musk oxen, goats) *
   3. Family Camelidae – non-ruminate (camels, llamas) *
   4. Family Cervidae – ruminate (deer, moose, reindeer, elk) *
   5. Family Giraffidae – ruminate (giraffes)
   6. Family Hippopotamidae – non-ruminate (hippopotamuses)
   7. Family Moschidae – ruminate (tusk like teeth and no antlers: musk deer)
   8. Family Tayassuidae – non-ruminate (peccaries) *?
   9. Family Tragulidae – primitive ruminate (mouse-deer)
   10. Family Suidae – non-ruminate (pigs)
3. Order Carnivora — Carnivorans (A – long snouts and unretractable claws & B – retractable claws)
   Show Families

   1. Family Ailuridae (red pandas) A
   2. Family Canidae (wolves, dogs, jackals, foxes) A *
   3. Family Felidae (cats, lions, cheetahs, leopards) B
   4. Family Herpestidae (mongoose, meerkats) B
   5. Family Hyaenidae (hyenas) B
   6. Family Mustelidae (martens, weasels, skunks, otters) A *
   7. Family Odobenidae (walruses) A
   8. Family Otariidae (fur seals & sea lions) A
   9. Family Phocidae (seals) A
   10. Family Procyonidae (coatis, raccoons, lesser pandas) A *
   11. Family Ursidae (bears, giant pandas) A *
   12. Family Viverridae (civets or genets) B
4. Order Cetacea — Cetaceans (A – baleen whales & B toothed whales)
   Show Families

   1. Family Balaenidae (bowhead whales and right whales) A
   2. Family Balaenopteridae (rorquals, minke whales, hump-backed whales) A
   3. Family Delphinidae (dolphins, killer whales, pilot whales, and relatives) B
   4.  Family Eschrichtiidae (gray whales) A
   5. Family Iniidae (river dolphins) B
   6. Family Monodontidae (narwhals, belugas) B
   7. Family Neobalaenidae (pygmy right whale) A
   8. Family Phocoenidae (porpoises) B
   9. Family Physeteridae (sperm whales) B
   10. Family Platanistidae (Indian river dolphins) B
   11. Family Ziphiidae (beaked whales) B
5. Order Chiroptera — Bats
   Show Families

   1. Family Craseonycteridae (bumblee bat and hog-nosed bat)
   2. Family Emballonuridae (sac-winged bats, sheath-tailed bats, and relatives)
   3. Family Furipteridae (smoky bats and thumbless bats)
   4. Family Hipposideridae (leaf-nosed bats, roundleaf bats, and trident bats) ??
   5. Family Megadermatidae (false vampire bats)
   6. Family Molossidae (free-tailed bats)
   7. Family Mormoopidae (ghost-faced bats, moustached bats, and naked-backed bats)
   8. Family Mystacinidae (New Zealand short-tailed bats)
   9. Family Myzopodidae (Old World sucker-footed bat)
   10. Family Natalidae (funnel-eared bats)
   11. Family Noctilionidae (bulldog bats)
   12. Family Nycteridae (slit-faced bats)
   13. Family Phyllostomidae (New World leaf-nosed bats)
   14. Family Pteropodidae (Old World fruit bats or flying foxes)
   15. Family Rhinolophidae (horseshoe bats)
   16. Family Rhinopomatidae (mouse-tailed bats)
   17. Family Thyropteridae (disc-winged bats)
   18. Family Vespertilionidae (evening bats and vesper bats)
6. Order Cingulata — Armadillos 
   Show Families

   1. Family Dasypodidae (armadillos)
7. Order Dermoptera — Colugos & flying lemurs
   Show Families

   1. Family Cynocephalidae (colugos and flying lemurs)
8. Order Eulipotyphla — Shrews, Moles, Hedgehogs, and Allies
   Show Families

   1. Family Erinaceidae (hedgehogs, moonrats and gymnures)
   2. Family Solenodontidae (solenodonts)
   3. Family Soricidae (shrews)
   4. Family Talpidae (desmans and moles)
9. Order Hyracoidea — Hyraxes
   Show Families

   1. Family Procaviidae (hyraxes)
10. Order Lagomorpha — Lagomorphs (rabbits, hares, pikas)
    Show Families

    1. Family Leporidae (hares and rabbits) *
    2. Family Ochotonidae (pikas) *
    3. Family Prolagidae (Mediterranean giant pikas)
11. Order Macroscelidea — Sengis (elephant-shrews)
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    1. Family Macroscelididea (elephant-shrews)
12. Order Perissodactyla — Odd-toed Ungulates
    Show Families

    1. Family Equidae (horses, donkeys, zebras)
    2. Family Tapiridae (tapirs)
    3. Family Rhinocerotidae (rhinoceroses)
13. Order Pholidota — Pangolins
    Show Families

    1. Family Manidae (pangolins)
14. Order Pilosa — Sloths and Anteaters
    Show Families

    1. Family Bradypodidae (three-toed sloths)
    2. Family Cyclopedidae (silky anteaters)
    3. Family Megalonychidae (two-toed sloths)
    4. Family Myrmecophagidae (anteaters)
15. Order Primates — Primates
    Show Families

    1. Family Aotidae (New World monkeys – night or owl monkeys)
    2. Family Atelidae (New World monkeys – howler, spider, woolly spider & woolly monkeys)
    3. Family Callitrichidae (marmosets)
    4. Family Callitrichidae (New World monkeys – marmosets and tamarins)
    5. Family Cheirogaleidae (dwarf & mouse lemurs)
    6. Family Cebidae (New World monkeys – capuchins and squirrel monkeys)
    7. Family Cercopithecidae (Old World monkeys, baboons)
    8. Family Daubentonlidae (aye-ayes)
    9. Family Hominidae (human beings)
    10. Family Hylobatidae (gibbons)
    11. Family Indriidae (arboreal Madagascan primates)
    12. Family Lemuridae (true lemurs)
    13. Family Lepilemuridae (sportive lemurs)
    14. Family Lorisidae (lorises, pottos)
    15. Family Pongidae (gorillas, chimpanzees, orangutans)
    16. Family Tarsiidae (tarsiers)
16. Order Proboscidea — Proboscideans (elephants)
    Show Families

    1. Family Elephantida
17. Order Rodentia — Rodents (A: scaly-tailed squirrels and spring hares; B: beavers, gophers, kangaroo rats, pocket mice, and relatives; C: hystricognath rodents; D: mice, rats, gerbils, jerboas, and relatives; E: squirrels, dormice, and relatives)
    Show Families

    1. Family Abrocomidae (chinchilla rats) C2
    2. Family Agoutidae (pacas) C2
    3. Family Anomaluridae (scaly-tailed squirrels) A
    4. Family Aplodontiidae (mountain beaver) E
    5. Family Bathyergidae (blesmoles and mole rats) C2
    6. Family Capromyidae (West Indian hutias) C2
    7. Family Calomyscidae (mouse-like hamsters) D2
    8. Family Castoridae (beavers) B
    9. Family Caviidae (cavies) C2
    10. Family Chinchillidae (chinchillas and viscachas) C2
    11. Family Cricetidae (New World rats and mice, voles, hamsters, and relatives) D2
    12. Family Ctenodactylidae (gundis) C1
    13. Family Ctenomyidae (tuco-tucos) C2
    14. Family Cuniculidae (pacas) C2
    15. Family Dasyproctidae (acuchis and agoutis) C2
    16. Family Dinomyidae (pacarana) C2
    17. Family Dipodidae (jerboas, jumping mice, and birch mice) D1
    18. Family Echimyidae (spiny rats) C2
    19. Family Erethizontidae (New World porcupines) C2
    20. Family Geomyidae (pocket gophers) B
    21. Family Gliridae (dormice and hazel mice) E
    22. Family Heptaxodontidae (giant hutias) C2
    23. Family Heteromyidae (kangaroo rats, pocket mice, and relatives) B
    24. Family Hydrochaeridae (capybara) C2
    25. Family Hystricidae (Old World porcupines) C2
    26. Family Muridae (Old World mice and rats, gerbils, whistling rats, and relatives) D2
    27. Family Myocastoridae (coypus and nutria) C2
    28. Family Nesomyidae (African and Malagasy endemic rats and mice) D2
    29. Family Octodontidae (degus, rock rats, and viscacha rats) C2
    30. Family Pedetidae (springhare) A
    31. Family Petromuridae (dassie rat) C2
    32. Family Platacanthomyidae (Malabar spiny dormouse and pygmy dormice) D2
    33. Family Sciuridae (squirrels) E
    34. Family Spalacidae (blind mole rats, African mole rats, zokors, and bamboo rats) D2
    35. Family Thryonomyidae (cane rats) C2
18. Order Scandentia — Treeshrews
    Show Families

    1. Family Tupalidae (tree shrew)
19. Order Sirenia — Sirenians (manatees, dugongs and sea cows)
    Show Families

    1. Family Dugongidae (dugong and sea cow)
    2. Family Trichechidae (manatees)
20. Order Tubulidentata — Aardvarks
    Show Families

    1. Family Orycteropodidae (aardvark)

 

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