Macaca fascicularis (Raffles, 1821)
Macaca sylvanus (Linnaeus, 1758)
Macaca sylvanus florentina (Cocchi, 1872)
Macraspis festiva Burmeister, 1844
Macrocephalon maleo Muller, 1846
Macrocheira kaempferi (Temminck, 1836)
Macroglossum stellatarum (Linnaeus, 1758)
Macropodus opercularis (Linnaeus, 1758)
Macropus rufogriseus (Desmarest, 1817)
Macropus rufus (Desmarest, 1822)
Macroscelides proboscideus (Shaw, 1800)
Macrothylacia rubi (Linnaeus, 1758)
Madoqua kirkii (Günther, 1880)
Magellania venosa (Dixon, 1789)
Magicicada septendecim (Linnaeus, 1758)
Malacosoma neustria (Linnaeus, 1758)
Mammuthus columbi Falconer, 1857
Mammuthus meridionalis Nesti, 1825
Mammuthus primigenius Blumenbach, 1799
Mammuthus trogontherii Pohlig, 1888
Mandrillus leucophaeus (Cuvier, 1807)
Mandrillus sphinx (Linnaeus, 1758)
Manis javanica Desmarest, 1822
Manta birostris (Walbaum, 1792) – synoniem of Mobula birostris (Walbaum, 1792)
Mantis religiosa (Linnaeus, 1758)
Maoricardium pseudolima (Lamarck, 1819)
Margarinotus brunneus (Fabricius, 1775)
Marmota marmota (Linnaeus, 1758)
Marrella splendens Walcott, 1912
Martes martes (Linnaeus, 1758)
Mauremys reevesii (Gray, 1831)
Mecistops cataphractus (Cuvier, 1825)
Megacerops coloradensis Leidy, 1870
Megaceryle torquata (Linnaeus, 1766)
Megalaima armillaris (Temminck, 1821)
Megaloceros giganteus Blumenbach, 1799
Megapomponia merula (Distant, 1905)
Megascolia maculata (Drury, 1773)
Melanitta americana (Swainson, 1832)
Melanitta fusca (Linnaeus, 1758)
Melanitta nigra (Linnaeus, 1758)
Melithaea ochracea (Linnaeus, 1758)
Melo aethiopicus (Linnaeus, 1758)
Melo umbilicatus Broderip, 1826
Melolontha melolontha (Linnaeus, 1758)
Meniscoessus robustus Osborn (1893)
Menura novaehollandiae Latham, 1802
Mephitis mephitis (Schreber, 1776)
Mergus merganser Linnaeus, 1758
Merlangius merlangus (Linnaeus, 1758)
Merops albicollis Vieillot, 1817
Merops apiaster Linnaeus, 1758
Mesocricetus auratus (Waterhouse, 1839)
Mesolimulus walchi Desmarest, 1822
Mesosaurus brasiliensis Mac Gregor 1908
Microhierax caerulescens (Linnaeus, 1758)
Micromys minutus (Pallas, 1771)
Microtus agrestis (Linnaeus, 1761)
Microtus arvalis (Pallas, 1778)
Microtus oeconomus (Pallas, 1776)
Millepora complanata Lamarck, 1816
Millepora tenera Boschma, 1949
Milvus milvus (Linnaeus, 1758)
Mimomys pliocaenicus (Forsyth Major, 1889)
Mimus longicaudatus Tschudi, 1844
Mitra grateloupi d'Orbigny,1852
Mobula birostris (Walbaum, 1792)
Mola tecta Nyegaard et al. 2017
Momotus momota (Linnaeus, 1766)
Monachidium lumun (Johannson, 1763)
Morus bassanus (Linnaeus, 1758)
Mosasaurus hoffmanni Mantell 1829
Muntiacus muntjak (Zimmermann, 1780)
Muntiacus reevesi (Ogilby, 1839)
Musca domestica Linnaeus, 1758
Muscicapa striata (Pallas, 1764)
Mustela erminea Linnaeus, 1758
Mustela lutreola (Linnaeus, 1761)
Mustela nivalis Linnaeus, 1766
Mustela putorius Linnaeus, 1758
Myathropa florea (Linnaeus, 1758)
Mycteria ibis (Linnaeus, 1766)
Myocastor coypus (Molina, 1782)
Myodes glareolus (Schreber, 1780)
Myodes rufocanus (Sundevall, 1846)
Myopa buccata (Linnaeus, 1758)
Myopus schisticolor (Lilljeborg, 1844)
Myotis daubentonii (Kuhl, 1817)
Myotis myotis (Borkhausen, 1797)