| leopardus tigrinus | Yes | species | eukaryota | mammals | species | 46842 | click here |
| leopardus wiedii | Yes | species | eukaryota | mammals | species | 61382 | click here |
| lepidochelys kempii | Yes | species | eukaryota | vertebrates | species | 8472 | click here |
| lepidochelys olivacea | Yes | species | eukaryota | vertebrates | species | 27788 | click here |
| leptonychotes weddellii | Yes | species | eukaryota | mammals | species | 9713 | click here |
| lepus granatensis | Yes | species | eukaryota | mammals | species | 100182 | click here |
| lobodon carcinophaga | Yes | species | eukaryota | mammals | species | 101849 | click here |
| lontra canadensis | Yes | species | eukaryota | mammals | species | 76717 | click here |
| lophocebus albigena | Yes | species | eukaryota | primates | species | 75567 | click here |
| lophocebus aterrimus | Yes | species | eukaryota | primates | species | 75566 | click here |
| lophophorus impejanus | Yes | species | eukaryota | vertebrates | species | 9040 | click here |
| loxodonta africana | Yes | species | eukaryota | mammals | species | 9785 | click here |
| lybius dubius | Yes | species | eukaryota | vertebrates | species | 240734 | click here |
| lycalopex culpaeus | Yes | species | eukaryota | mammals | species | 68736 | click here |
| lycalopex fulvipes | Yes | species | eukaryota | mammals | species | 354191 | click here |
| lycalopex griseus | Yes | species | | | species | 68737 | click here |
| lynx canadensis | Yes | species | eukaryota | mammals | species | 61383 | click here |
| lynx canadensis subsolanus | Yes | subspecies | | | subspecies | 1605429 | click here |
| lynx lynx | Yes | species | eukaryota | mammals | species | 13125 | click here |
| lynx pardinus | Yes | species | eukaryota | mammals | species | 191816 | click here |
| lynx rufus | Yes | species | eukaryota | mammals | species | 61384 | click here |
| macaca arctoides | Yes | species | eukaryota | primates | species | 9540 | click here |
| macaca assamensis | Yes | species | eukaryota | primates | species | 9551 | click here |
| macaca cyclopis | Yes | species | eukaryota | primates | species | 78449 | click here |
| macaca fascicularis | Yes | species | eukaryota | primates | species | 9541 | click here |
| macaca fuscata | Yes | species | eukaryota | primates | species | 9542 | click here |
| macaca fuscata fuscata | Yes | subspecies | eukaryota | primates | subspecies | 9543 | click here |
| macaca mulatta | Yes | species | eukaryota | primates | species | 9544 | click here |
| macaca nemestrina | Yes | species | eukaryota | primates | species | 9545 | click here |
| macaca radiata | Yes | species | eukaryota | primates | species | 9548 | click here |
| macaca silenus | Yes | species | eukaryota | primates | species | 54601 | click here |
| macaca speciosa | Yes | species | eukaryota | primates | species | 9553 | click here |
| macaca sylvanus | Yes | species | eukaryota | primates | species | 9546 | click here |
| macaca thibetana | Yes | species | eukaryota | primates | species | 54602 | click here |
| macropodidae | Yes | | | mammals | family | 9307 | click here |
| macropus eugenii | Yes | species | eukaryota | mammals | species | 9315 | click here |
| macropus giganteus | Yes | species | eukaryota | mammals | species | 9317 | click here |
| macropus parma | Yes | species | eukaryota | mammals | species | 413582 | click here |
| mandrillus leucophaeus | Yes | species | eukaryota | primates | species | 9568 | click here |
| mandrillus sphinx | Yes | species | eukaryota | primates | species | 9561 | click here |
| marmosets | Yes | no rank | eukaryota | primates | species | 38020 | click here |
| martes americana | Yes | species | eukaryota | mammals | species | 9660 | click here |
| martes foina | Yes | species | eukaryota | mammals | species | 9659 | click here |
| martes pennanti | Yes | species | eukaryota | mammals | species | 76720 | click here |
| mastomys natalensis | Yes | species | eukaryota | rodents | species | 10112 | 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 |
| mephitis mephitis | Yes | species | eukaryota | mammals | species | 30548 | click here |
| mesocricetus auratus | Yes | species | eukaryota | rodents | species | 10036 | click here |
| mesoplodon densirostris | Yes | species | eukaryota | mammals | species | 48708 | click here |
| mesoplodon stejnegeri | Yes | species | eukaryota | mammals | species | 52114 | click here |
| microcebus murinus | Yes | species | eukaryota | primates | species | 30608 | click here |
| microtus agrestis | Yes | species | eukaryota | rodents | species | 29092 | click here |
| microtus arvalis | Yes | species | eukaryota | rodents | species | 47230 | click here |
| miniopterus fuliginosus | Yes | species | eukaryota | mammals | species | 187007 | click here |
| miniopterus natalensis | Yes | species | eukaryota | mammals | species | 291302 | click here |
| miniopterus schreibersii | Yes | species | eukaryota | mammals | species | 9433 | click here |
| miopithecus talapoin | Yes | species | eukaryota | primates | species | 36231 | click here |
| mirounga angustirostris | Yes | species | eukaryota | mammals | species | 9716 | click here |
| molossus molossus | Yes | species | eukaryota | mammals | species | 27622 | click here |
| muntiacus reevesi | Yes | species | eukaryota | mammals | species | 9886 | click here |
| mus cervicolor | Yes | species | eukaryota | rodents | species | 10097 | click here |
| mus musculus | Yes | species | eukaryota | rodents | species | 10090 | click here |
| mus musculus domesticus | Yes | subspecies | eukaryota | rodents | subspecies | 10092 | click here |
| mus musculus musculus | Yes | subspecies | eukaryota | rodents | subspecies | 39442 | click here |
| mus spicilegus | Yes | species | eukaryota | rodents | species | 10103 | click here |
| mustela erminea | Yes | species | eukaryota | mammals | species | 36723 | click here |
| mustela lutreola | Yes | species | eukaryota | mammals | species | 9666 | click here |
| mustela putorius | Yes | species | eukaryota | mammals | species | 9668 | click here |
| mustela putorius furo | Yes | subspecies | eukaryota | mammals | subspecies | 9669 | click here |
| mustelinae | Yes | | | mammals | subfamily | 169418 | click here |
| mya arenaria | Yes | species | eukaryota | invertebrates | species | 6604 | click here |
| myodes glareolus | Yes | species | eukaryota | rodents | species | 447135 | click here |
| myotis alcathoe | Yes | species | eukaryota | mammals | species | 155916 | click here |
| myotis bechsteinii | Yes | species | eukaryota | mammals | species | 59462 | click here |
| myotis capaccinii | Yes | species | eukaryota | mammals | species | 109477 | click here |
| myotis daubentonii | Yes | species | eukaryota | mammals | species | 98922 | click here |
| myotis emarginatus | Yes | species | eukaryota | mammals | species | 109480 | click here |
| myotis escalerai | Yes | species | eukaryota | mammals | species | 508772 | click here |
| myotis myotis | Yes | species | eukaryota | mammals | species | 51298 | click here |
| myotis mystacinus | Yes | species | eukaryota | mammals | species | 109479 | click here |
| myotis ricketti | Yes | species | eukaryota | mammals | species | 203696 | click here |
| myotis sp. | Yes | species | | | species | 1911917 | click here |
| myotis velifer | Yes | species | eukaryota | mammals | species | 9435 | click here |
| nanger granti | Yes | species | eukaryota | mammals | species | 27591 | click here |
| nannopterum brasilianus | Yes | species | eukaryota | vertebrates | species | 37046 | click here |
| neomonachus schauinslandi | Yes | species | eukaryota | mammals | species | 29088 | click here |
| neopsephotus bourkii | Yes | species | eukaryota | vertebrates | species | 309878 | click here |
| neoromicia capensis | Yes | species | eukaryota | mammals | species | 110938 | click here |
| neoromicia helios | Yes | species | | | species | 1381466 | click here |
| neovison vison | Yes | species | eukaryota | mammals | species | 452646 | click here |
| nephelomys devius | Yes | species | | | species | 1734924 | click here |
| ninox boobook | Yes | species | eukaryota | vertebrates | species | 507961 | click here |
| ninox strenua | Yes | species | eukaryota | vertebrates | species | 73883 | click here |
| nomascus leucogenys | Yes | species | eukaryota | primates | species | 61853 | click here |
| nyctalus lasiopterus | Yes | species | eukaryota | mammals | species | 59464 | click here |
| nyctalus leisleri | Yes | species | eukaryota | mammals | species | 59465 | click here |
| nyctalus noctula | Yes | species | eukaryota | mammals | species | 51300 | click here |
| nyctereutes procyonoides | Yes | species | eukaryota | mammals | species | 34880 | click here |