| macaca assamensis | Yes | species | eukaryota | primates | species | 9551 | click here |
| macaca fascicularis | Yes | species | eukaryota | primates | species | 9541 | click here |
| macaca fuscata | Yes | species | eukaryota | primates | species | 9542 | click here |
| macaca mulatta | Yes | species | eukaryota | primates | species | 9544 | click here |
| macaca sinica | Yes | species | eukaryota | primates | species | 9552 | click here |
| maccullochella peelii | Yes | species | eukaryota | vertebrates | species | 135761 | click here |
| macrochelys temminckii | Yes | species | eukaryota | vertebrates | species | 571338 | click here |
| macropodidae | Yes | | | mammals | family | 9307 | click here |
| macropus giganteus | Yes | species | eukaryota | mammals | species | 9317 | click here |
| macropus rufus | Yes | species | eukaryota | mammals | species | 9321 | click here |
| macropus sp. | Yes | no rank | eukaryota | mammals | species | 9322 | click here |
| malacochersus tornieri | Yes | species | eukaryota | vertebrates | species | 286009 | click here |
| mammalia | Yes | | | mammals | class | 40674 | click here |
| marmosa murina | Yes | species | eukaryota | mammals | species | 126295 | click here |
| marmota flaviventris | Yes | species | eukaryota | rodents | species | 93162 | click here |
| marmota himalayana | Yes | species | eukaryota | rodents | species | 93163 | click here |
| marmota monax | Yes | species | eukaryota | rodents | species | 9995 | click here |
| martes martes | Yes | species | eukaryota | mammals | species | 29065 | click here |
| martes pennanti | Yes | species | eukaryota | mammals | species | 76720 | click here |
| mauremys caspica | Yes | species | eukaryota | vertebrates | species | 202459 | click here |
| mazama americana | Yes | species | eukaryota | mammals | species | 43334 | click here |
| mazama gouazoupira | Yes | species | eukaryota | mammals | species | 52407 | click here |
| mazama nana | Yes | species | eukaryota | mammals | species | 397613 | click here |
| meleagris gallopavo | Yes | species | eukaryota | vertebrates | species | 9103 | click here |
| meles meles | Yes | species | eukaryota | mammals | species | 9662 | click here |
| melopsittacus undulatus | Yes | species | eukaryota | vertebrates | species | 13146 | click here |
| mephitidae | Yes | | | mammals | family | 119825 | click here |
| mephitis mephitis | Yes | species | eukaryota | mammals | species | 30548 | click here |
| meriones unguiculatus | Yes | species | eukaryota | rodents | species | 10047 | click here |
| merlangius merlangus | Yes | species | eukaryota | vertebrates | species | 8058 | click here |
| mesocricetus auratus | Yes | species | eukaryota | rodents | species | 10036 | click here |
| metatheria | Yes | | | mammals | no rank | 9263 | click here |
| metazoa | Yes | | | invertebrates | kingdom | 33208 | click here |
| microtus agrestis | Yes | species | eukaryota | rodents | species | 29092 | click here |
| microtus arvalis | Yes | species | eukaryota | rodents | species | 47230 | click here |
| microtus cabrerae | Yes | species | eukaryota | rodents | species | 70284 | click here |
| microtus pennsylvanicus | Yes | species | eukaryota | rodents | species | 10058 | click here |
| microtus pinetorum | Yes | species | eukaryota | rodents | species | 111839 | click here |
| mirounga leonina | Yes | species | eukaryota | mammals | species | 9715 | click here |
| molva dipterygia | Yes | species | eukaryota | vertebrates | species | 185738 | click here |
| morelia spilota | Yes | species | eukaryota | vertebrates | species | 51896 | click here |
| muntiacus muntjak | Yes | species | eukaryota | mammals | species | 9888 | click here |
| mus | Yes | | | rodents | genus | 10088 | click here |
| mus musculus | Yes | species | eukaryota | rodents | species | 10090 | click here |
| mus musculus domesticus | Yes | subspecies | eukaryota | rodents | subspecies | 10092 | click here |
| mus spretus | Yes | species | eukaryota | rodents | species | 10096 | click here |
| mustela lutreola | Yes | species | eukaryota | mammals | species | 9666 | click here |
| mustela nivalis | Yes | species | eukaryota | mammals | species | 36239 | click here |
| mustela putorius furo | Yes | subspecies | eukaryota | mammals | subspecies | 9669 | click here |
| mustelidae | Yes | | | mammals | family | 9655 | click here |
| mustelinae | Yes | | | mammals | subfamily | 169418 | click here |
| myocastor coypus | Yes | species | eukaryota | rodents | species | 10157 | click here |
| myodes gapperi | Yes | species | eukaryota | rodents | species | 473866 | click here |
| myodes glareolus | Yes | species | eukaryota | rodents | species | 447135 | click here |
| myodes rufocanus bedfordiae | Yes | subspecies | eukaryota | rodents | subspecies | 36236 | click here |
| myotis ciliolabrum | Yes | species | eukaryota | mammals | species | 257884 | click here |
| myotragus balearicus | Yes | species | eukaryota | mammals | species | 201717 | click here |
| mytilus | Yes | | | invertebrates | genus | 6548 | click here |
| mytilus edulis | Yes | species | eukaryota | invertebrates | species | 6550 | click here |
| mytilus sp. | Yes | no rank | eukaryota | invertebrates | species | 61855 | click here |
| naja naja | Yes | species | eukaryota | vertebrates | species | 35670 | click here |
| neochmia modesta | Yes | species | eukaryota | vertebrates | species | 267974 | click here |
| neodon fuscus | Yes | species | | | species | 771787 | click here |
| neophema | Yes | | | vertebrates | genus | 35536 | click here |
| neovison vison | Yes | species | eukaryota | mammals | species | 452646 | click here |
| nyctereutes procyonoides | Yes | species | eukaryota | mammals | species | 34880 | click here |
| nymphicus hollandicus | Yes | species | eukaryota | vertebrates | species | 13180 | click here |
| ochotona curzoniae | Yes | species | eukaryota | mammals | species | 130825 | click here |
| odocoileus virginianus | Yes | species | eukaryota | mammals | species | 9874 | click here |
| oncorhynchus mykiss | Yes | species | eukaryota | vertebrates | species | 8022 | click here |
| ondatra zibethicus | Yes | species | eukaryota | rodents | species | 10060 | click here |
| oreamnos americanus | Yes | species | eukaryota | mammals | species | 34873 | click here |
| oryctolagus cuniculus | Yes | species | eukaryota | mammals | species | 9986 | click here |
| oryzoborus maximiliani | Yes | species | eukaryota | vertebrates | species | 548488 | click here |
| ostreidae | Yes | | | invertebrates | family | 6563 | click here |
| otospermophilus beecheyi | Yes | species | eukaryota | rodents | species | 34862 | click here |
| ovibos moschatus | Yes | species | eukaryota | mammals | species | 37176 | click here |
| ovibos moschatus wardi | Yes | subspecies | eukaryota | mammals | subspecies | 167725 | click here |
| ovis | Yes | | | mammals | genus | 9935 | click here |
| ovis ammon | Yes | species | eukaryota | mammals | species | 30527 | click here |
| ovis aries | Yes | species | eukaryota | mammals | species | 9940 | click here |
| ovis aries musimon | Yes | subspecies | eukaryota | mammals | subspecies | 9938 | click here |
| oxyuranus scutellatus | Yes | species | eukaryota | vertebrates | species | 8668 | click here |
| padda oryzivora | Yes | species | eukaryota | vertebrates | species | 267976 | click here |
| paguma larvata | Yes | species | eukaryota | mammals | species | 9675 | click here |
| pan troglodytes | Yes | species | eukaryota | primates | species | 9598 | click here |
| pan troglodytes troglodytes | Yes | subspecies | eukaryota | primates | subspecies | 37011 | click here |
| pan troglodytes verus | Yes | subspecies | eukaryota | primates | subspecies | 37012 | click here |
| panthera leo | Yes | species | eukaryota | mammals | species | 9689 | click here |
| panthera pardus | Yes | species | eukaryota | mammals | species | 9691 | click here |
| panthera tigris | Yes | species | eukaryota | mammals | species | 9694 | click here |
| pantherophis guttatus | Yes | species | eukaryota | vertebrates | species | 94885 | click here |
| pantherophis obsoletus | Yes | species | eukaryota | vertebrates | species | 39099 | click here |
| pantherophis obsoletus quadrivittata | Yes | subspecies | eukaryota | vertebrates | subspecies | 61287 | click here |
| pantholops hodgsonii | Yes | species | eukaryota | mammals | species | 59538 | click here |
| papio | Yes | | | primates | genus | 9554 | click here |
| papio hamadryas | Yes | species | eukaryota | primates | species | 9557 | click here |
| paracheirodon innesi | Yes | species | eukaryota | vertebrates | species | 42492 | click here |
| pavo cristatus | Yes | species | eukaryota | vertebrates | species | 9049 | click here |
| perameles bougainville | Yes | species | eukaryota | mammals | species | 120735 | click here |