There are 137 mammals that start with the letter M, from Macaque to Méditerranée Dolphin. Below you will find them listed alphabetically along with some general information about each. Click the toggle view buttons in the top right corner to switch between the card and the table view.
For each item you will find the following information
Order: The subclass the mammals belongs to
Habitat: The places or type of weather the mammals lives in
Scientific name: The designation that scientists use to catalog the species
Name: Macaque
Order: Primates
Habitat: Asia
Scientific name: Macaca spp.
Name: Macrohystrix
Order: Rodentia
Habitat: Tropical forests of Southeast Asia
Scientific name: Macrohystrix cristata
Name: Macropteromys
Order: Rodentia
Habitat: Tropical forests of Sulawesi
Scientific name: Macropteromys celebensis
Name: Macroscelidea
Order: Afrosoricida
Habitat: Arid regions of southern Africa
Scientific name: Macroscelides proboscideus
Name: Macrosphenidae
Order: Passeriformes
Habitat: Africa
Scientific name: Macrosphenus
Name: Malachite Monito del Monte
Order: Paucituberculata
Habitat: Temperate forests of South America
Scientific name: Dromiciops gliroides
Name: Malacomys
Order: Rodentia
Habitat: Forests of Central and West Africa
Scientific name: Malacomys longipes
Name: Malagasy Dwarf Lemur
Order: Primates
Habitat: Madagascar
Scientific name: Cheirogaleus medius
Name: Malagasy Giant Rat
Order: Rodentia
Habitat: Madagascar
Scientific name: Hypogeomys antimena
Name: Malagasy Jumping Rat
Order: Rodentia
Habitat: Madagascar
Scientific name: Hypogeomys sp.
Name: Malagasy Striped Civet
Order: Carnivora
Habitat: Madagascar
Scientific name: Fossa fossana
Name: Malayan Bamboo Rat
Order: Rodentia
Habitat: Bamboo forests of Southeast Asia
Scientific name: Cannomys badius
Name: Malayan Civet
Order: Carnivora
Habitat: Tropical forests of Southeast Asia
Scientific name: Viverra tangalunga
Name: Malayan Colugo
Order: Dermoptera
Habitat: Southeast Asia
Scientific name: Galeopterus variegatus
Name: Malayan Flying Lemur
Order: Dermoptera
Habitat: Southeast Asia
Scientific name: Galeopterus variegatus
Name: Malayan Giant Squirrel
Order: Rodentia
Habitat: Southeast Asia
Scientific name: Ratufa affinis
Name: Malayan Porcupine
Order: Rodentia
Habitat: Southeast Asia
Scientific name: Hystrix brachyura
Name: Malayan Sun Bear
Order: Carnivora
Habitat: Southeast Asia
Scientific name: Helarctos malayanus
Name: Malayan Sunbear
Order: Carnivora
Habitat: Southeast Asia
Scientific name: Helarctos malayanus
Name: Malayan Tapir
Order: Perissodactyla
Habitat: Southeast Asia
Scientific name: Tapirus indicus
Name: Malayan Tiger
Order: Carnivora
Habitat: Southeast Asia
Scientific name: Panthera tigris jacksoni
Name: Malayan Water Monitor
Order: Squamata
Habitat: Southeast Asia
Scientific name: Varanus salvator
Name: Malayan Weasel
Order: Carnivora
Habitat: Southeast Asia
Scientific name: Mustela nudipes
Name: Malayan Woodland Dormouse
Order: Rodentia
Habitat: Southeast Asia
Scientific name: Graphiurus peeli
Name: Malayan Woolly Bat
Order: Chiroptera
Habitat: Tropical forests of Southeast Asia
Scientific name: Kerivoula intermedia
Name: Malayasia Banxring
Order: Pholidota
Habitat: Southeast Asia
Scientific name: Manis javanica
Name: Malea Mouse-eared Bat
Order: Chiroptera
Habitat: Endemic to the Malea Peninsula in Greece
Scientific name: Myotis maeleae
Name: Maleo
Order: Aves
Habitat: Indonesia
Scientific name: Macrocephalon maleo
Name: Mallomys
Order: Rodentia
Habitat: Montane forests of New Guinea
Scientific name: Mallomys rothschildi
Name: Malpelo Island Weasel
Order: Carnivora
Habitat: Malpelo Island
Scientific name: Mustela malpeloensis
Name: Mammoths
Order: Proboscidea
Habitat: Extinct
Scientific name: Mammuthus sp.
Name: Manatee
Order: Sirenia
Habitat: Coastal waters and rivers in the Americas and West Africa
Scientific name: Trichechus spp.
Name: Manchurian Lynx
Order: Carnivora
Habitat: Eastern Asia
Scientific name: Lynx lynx stroganovi
Name: Mandarin Vole
Order: Rodentia
Habitat: East Asia
Scientific name: Lasiopodomys mandarinus
Name: Mandrill
Order: Primates
Habitat: Central Africa
Scientific name: Mandrillus sphinx
Name: Maned Wolf
Order: Carnivora
Habitat: South America
Scientific name: Chrysocyon brachyurus
Name: Mangabey
Order: Primates
Habitat: Africa
Scientific name: Cercocebus spp.
Name: Manidae
Order: Pholidota
Habitat: Tropical forests of Asia and Africa
Scientific name: Manis
Name: Manila Mouse Deer
Order: Artiodactyla
Habitat: Philippines
Scientific name: Tragulus nigricans
Name: Maonan
Order: Primates
Habitat: Vietnam
Scientific name: Rhinopithecus avunculus
Name: Maral
Order: Artiodactyla
Habitat: Central Asia
Scientific name: Cervus elaphus maral
Name: Marbled Cat
Order: Carnivora
Habitat: Tropical forests of Southeast and East Asia
Scientific name: Pardofelis marmorata
Name: Margay
Order: Carnivora
Habitat: Tropical forests of Central and South America
Scientific name: Leopardus wiedii
Name: Markhor
Order: Artiodactyla
Habitat: Central Asia
Scientific name: Capra falconeri
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Name: Markhor (Pir Panjal)
Order: Artiodactyla
Habitat: Kashmir
Scientific name: Capra falconeri cashmiriensis
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Name: Markhor (Suleman)
Order: Artiodactyla
Habitat: Pakistan
Scientific name: Capra falconeri jerdoni
Name: Marmoset
Order: Primates
Habitat: South America
Scientific name: Callitrichidae
Name: Marmoset Tamarin
Order: Primates
Habitat: South America
Scientific name: Callithrix
Name: Marmot
Order: Rodentia
Habitat: Mountainous regions of North America and Eurasia
Scientific name: Marmota spp.
Name: Marmota
Order: Rodentia
Habitat: Mountainous regions of North America and Eurasia
Scientific name: Marmota
Name: Marquesan Flying Fox
Order: Chiroptera
Habitat: Marquesas Islands
Scientific name: Pteropus mariannus
Name: Marsh Deer
Order: Artiodactyla
Habitat: South America
Scientific name: Blastocerus dichotomus
Name: Marsh Rabbit
Order: Lagomorpha
Habitat: Southeastern United States
Scientific name: Sylvilagus palustris
Name: Marsh Rice Rat
Order: Rodentia
Habitat: North America
Scientific name: Oryzomys palustris
Name: Marshfield Fox
Order: Carnivora
Habitat: North America
Scientific name: Vulpes fulva marshfieldi
Name: Marsupial Mole
Order: Notoryctemorphia
Habitat: Australia
Scientific name: Notoryctes
Name: Martens
Order: Carnivora
Habitat: Temperate and boreal forests of Eurasia and North America
Scientific name: Martes spp.
Name: Martinique Hog-nosed Bat
Order: Chiroptera
Habitat: Martinique
Scientific name: Anoura geoffroyi
Name: Mascarene Flying Fox
Order: Chiroptera
Habitat: Mascarene Islands
Scientific name: Pteropus subniger
Name: Massoutiera
Order: Rodentia
Habitat: Arid regions of North Africa
Scientific name: Massoutiera mzabi
Name: Mastiff Bat
Order: Chiroptera
Habitat: Latin America and the Caribbean
Scientific name: Molossus molossus
Name: Matschie's Tree Kangaroo
Order: Diprotodontia
Habitat: Montane rainforests of New Guinea
Scientific name: Dendrolagus matschiei
Name: Maui Dolphin
Order: Cetacea
Habitat: Coastal waters around New Zealand
Scientific name: Cephalorhynchus hectori maui
Name: Maui Nui Bat
Order: Chiroptera
Habitat: Hawaii
Scientific name: Lasiurus semotus
Name: Mauritanian Gerbil
Order: Rodentia
Habitat: Mauritania
Scientific name: Gerbillus mauritaniae
Name: Mauritian Flying Fox
Order: Chiroptera
Habitat: Mauritius
Scientific name: Pteropus niger
Name: Mauritian Fruit Bat
Order: Chiroptera
Habitat: Mauritius
Scientific name: Pteropus subniger
Name: Mauritian Tomb Bat
Order: Chiroptera
Habitat: Mauritius
Scientific name: Taphozous mauritianus
Name: Mauritius Flying Fox
Order: Chiroptera
Habitat: Mauritius
Scientific name: Pteropus niger
Name: Maxwell's Duiker
Order: Artiodactyla
Habitat: Tropical forests of West and Central Africa
Scientific name: Philantomba maxwellii
Name: Mayotte Flying Fox
Order: Chiroptera
Habitat: Mayotte
Scientific name: Pteropus mayottensis
Name: Mayotte Lemur
Order: Primates
Habitat: Forests of Mayotte island
Scientific name: Eulemur flavifrons
Name: Mayotte Shrew
Order: Eulipotyphla
Habitat: Mayotte
Scientific name: Sorex mayottensis
Name: Mazama Deer
Order: Artiodactyla
Habitat: Tropical and temperate forests of the Americas
Scientific name: Mazama spp.
Name: Meadow Jumping Mouse
Order: Rodentia
Habitat: Meadows and grasslands of North America
Scientific name: Zapus hudsonius
Name: Meadow Vole
Order: Rodentia
Habitat: North America
Scientific name: Microtus pennsylvanicus
Name: Mediterranean House Mouse
Order: Rodentia
Habitat: Mediterranean region
Scientific name: Mus spretus
Name: Mediterranean Monk Seal
Order: Carnivora
Habitat: Mediterranean Sea
Scientific name: Monachus monachus
Name: Meerkat
Order: Carnivora
Habitat: Deserts and grasslands of southern Africa
Scientific name: Suricata suricatta
Name: Merriam's Kangaroo Rat
Order: Rodentia
Habitat: Deserts of southwestern North America
Scientific name: Dipodomys merriami
Name: Mesoplodon
Order: Cetacea
Habitat: Deep ocean waters worldwide
Scientific name: Mesoplodon
Name: Mexican Gray Wolf
Order: Carnivora
Habitat: Forests and mountains of Mexico and southwestern United States
Scientific name: Canis lupus baileyi
Name: Mexican Long-nosed Bat
Order: Chiroptera
Habitat: Forests and caves of Mexico and southwestern United States
Scientific name: Leptonycteris nivalis
Name: Mhorr Gazelle
Order: Artiodactyla
Habitat: North Africa
Scientific name: Nanger dama mhorr
Name: Microbat
Order: Chiroptera
Habitat: worldwide
Scientific name: various species
Name: Microbiotheriidae
Order: Didelphimorphia
Habitat: Forests of southern South America
Scientific name: Microbiotheriidae
Name: Microbiotherium
Order: Didelphimorphia
Habitat: Forests of southern South America
Scientific name: Microbiotherium tehuelchum
Name: Microtus
Order: Rodentia
Habitat: Grasslands and tundra of the Northern Hemisphere
Scientific name: Microtus
Name: Milky Stork
Order: Strigiformes
Habitat: Southeast Asia
Scientific name: Mycteria cinerea
Name: Mimic Poison Frog
Order: Anura
Habitat: South America
Scientific name: Ranitomeya imitator
Name: Mindanao Gymnure
Order: Eulipotyphla
Habitat: Forests of the Philippines
Scientific name: Podogymnura truei
Name: Mindanao Tube-nosed Fruit Bat
Order: Chiroptera
Habitat: Forests of the Philippines
Scientific name: Nyctimene rabori
Name: Mindoro Stripe-faced Fruit Bat
Order: Chiroptera
Habitat: Philippines
Scientific name: Styloctenium mindorensis
Name: Mindoro Striped Shrew
Order: Eulipotyphla
Habitat: Philippines
Scientific name: Crocidura mindorensis
Name: Mindoro Warty Pig
Order: Artiodactyla
Habitat: Philippines
Scientific name: Sus oliveri
Name: Miniature Pinscher
Order: Carnivora
Habitat: Worldwide
Scientific name: Canis lupus familiaris
Name: Miniature Silky Anteater
Order: Pilosa
Habitat: Forests of Central and South America
Scientific name: Cyclopes ida
Name: Miniopterus
Order: Chiroptera
Habitat: Caves and mines worldwide
Scientific name: Miniopterus
Name: Mink
Order: Carnivora
Habitat: North America and Europe
Scientific name: Neovison spp.
Name: Mink Whale
Order: Cetacea
Habitat: Worldwide in temperate and polar oceans
Scientific name: Balaenoptera acutorostrata
Name: Minke Whale
Order: Cetacea
Habitat: Oceans worldwide
Scientific name: Balaenoptera acutorostrata
Name: Missouri Fox Squirrel
Order: Rodentia
Habitat: North America
Scientific name: Sciurus niger
Name: Mithan
Order: Artiodactyla
Habitat: Forests of Northeast India and Myanmar
Scientific name: Bos frontalis
Name: Mohor Gazelle
Order: Artiodactyla
Habitat: North Africa
Scientific name: Nanger dama mhorr
Name: Mole-rat
Order: Rodentia
Habitat: Africa
Scientific name: Bathyergidae spp.
Name: Moluccan Cuscus
Order: Diprotodontia
Habitat: Indonesia
Scientific name: Phalanger ornatus
Name: Moluccan Rat
Order: Rodentia
Habitat: Indonesia
Scientific name: Bunomys spp.
Name: Moluccan Tarsius
Order: Primates
Habitat: Indonesia
Scientific name: Tarsius splendidulus
Name: Mongolian Gazelle
Order: Artiodactyla
Habitat: Central Asia
Scientific name: Procapra gutturosa
Name: Mongolian Marmot
Order: Rodentia
Habitat: Grasslands of Mongolia
Scientific name: Marmota sibirica
Name: Mongoose
Order: Carnivora
Habitat: Africa and Asia
Scientific name: Herpestes spp.
Name: Monito del Monte
Order: Paucituberculata
Habitat: South America
Scientific name: Dromiciops gliroides
Name: Monkey
Order: Primates
Habitat: Africa and Asia
Scientific name: Cercopithecidae spp.
Name: Montane Vole
Order: Rodentia
Habitat: Western North America
Scientific name: Microtus montanus
Name: Moose
Order: Artiodactyla
Habitat: Boreal and temperate forests of North America and Eurasia
Scientific name: Alces alces
Name: Mouflon
Order: Artiodactyla
Habitat: Mediterranean region
Scientific name: Ovis orientalis
Name: Mountain Beaver
Order: Rodentia
Habitat: Western North America
Scientific name: Aplodontia rufa
Name: Mountain Bongo
Order: Artiodactyla
Habitat: East Africa
Scientific name: Tragelaphus eurycerus isaaci
Name: Mountain Cottontail
Order: Lagomorpha
Habitat: North America
Scientific name: Sylvilagus nuttallii
Name: Mountain Goat
Order: Artiodactyla
Habitat: Western North America
Scientific name: Oreamnos americanus
Name: Mountain Gorilla
Order: Primates
Habitat: Central Africa
Scientific name: Gorilla beringei beringei
Name: Mountain Hare
Order: Lagomorpha
Habitat: Mountainous regions of Eurasia
Scientific name: Lepus timidus
Name: Mountain Lion
Order: Carnivora
Habitat: Varied habitats across the Americas
Scientific name: Puma concolor
Name: Mountain Nyala
Order: Artiodactyla
Habitat: Ethiopia
Scientific name: Tragelaphus buxtoni
Name: Mountain Pygmy Possum
Order: Diprotodontia
Habitat: Australia
Scientific name: Burramys parvus
Name: Mountain Tapir
Order: Perissodactyla
Habitat: Montane forests of Colombia and Ecuador
Scientific name: Tapirus pinchaque
Name: Mountain Yellow-legged Frog
Order: Anura
Habitat: High-elevation lakes and streams of western North America
Scientific name: Rana muscosa
Name: Mouse
Order: Rodentia
Habitat: Worldwide
Scientific name: Mus spp.
Name: Mouse Lemur
Order: Primates
Habitat: Madagascar
Scientific name: Microcebus spp.
Name: Mozambique Mouse
Order: Rodentia
Habitat: Africa
Scientific name: Mus minutoides
Name: Muir's Digging Mouse
Order: Rodentia
Habitat: Grasslands of Australia
Scientific name: Mus murrayi
Name: Muriqui
Order: Primates
Habitat: Southeastern Brazil
Scientific name: Brachyteles
Name: Musk Ox
Order: Artiodactyla
Habitat: Arctic North America and Greenland
Scientific name: Ovibos moschatus
Name: Muskrat
Order: Rodentia
Habitat: North America
Scientific name: Ondatra zibethicus
Name: Mustang
Order: Perissodactyla
Habitat: North America
Scientific name: Equus ferus caballus
Name: Myotis
Order: Chiroptera
Habitat: Worldwide
Scientific name: Myotis spp.
Name: Méditerranée Dolphin
Order: Cetacea
Habitat: Mediterranean Sea
Scientific name: Stenella coeruleoalba
| Name | Order | Habitat | Scientific name |
|---|---|---|---|
| Macaque | Primates | Asia | Macaca spp. |
| Macrohystrix | Rodentia | Tropical forests of Southeast Asia | Macrohystrix cristata |
| Macropteromys | Rodentia | Tropical forests of Sulawesi | Macropteromys celebensis |
| Macroscelidea | Afrosoricida | Arid regions of southern Africa | Macroscelides proboscideus |
| Macrosphenidae | Passeriformes | Africa | Macrosphenus |
| Malachite Monito del Monte | Paucituberculata | Temperate forests of South America | Dromiciops gliroides |
| Malacomys | Rodentia | Forests of Central and West Africa | Malacomys longipes |
| Malagasy Dwarf Lemur | Primates | Madagascar | Cheirogaleus medius |
| Malagasy Giant Rat | Rodentia | Madagascar | Hypogeomys antimena |
| Malagasy Jumping Rat | Rodentia | Madagascar | Hypogeomys sp. |
| Malagasy Striped Civet | Carnivora | Madagascar | Fossa fossana |
| Malayan Bamboo Rat | Rodentia | Bamboo forests of Southeast Asia | Cannomys badius |
| Malayan Civet | Carnivora | Tropical forests of Southeast Asia | Viverra tangalunga |
| Malayan Colugo | Dermoptera | Southeast Asia | Galeopterus variegatus |
| Malayan Flying Lemur | Dermoptera | Southeast Asia | Galeopterus variegatus |
| Malayan Giant Squirrel | Rodentia | Southeast Asia | Ratufa affinis |
| Malayan Porcupine | Rodentia | Southeast Asia | Hystrix brachyura |
| Malayan Sun Bear | Carnivora | Southeast Asia | Helarctos malayanus |
| Malayan Sunbear | Carnivora | Southeast Asia | Helarctos malayanus |
| Malayan Tapir | Perissodactyla | Southeast Asia | Tapirus indicus |
| Malayan Tiger | Carnivora | Southeast Asia | Panthera tigris jacksoni |
| Malayan Water Monitor | Squamata | Southeast Asia | Varanus salvator |
| Malayan Weasel | Carnivora | Southeast Asia | Mustela nudipes |
| Malayan Woodland Dormouse | Rodentia | Southeast Asia | Graphiurus peeli |
| Malayan Woolly Bat | Chiroptera | Tropical forests of Southeast Asia | Kerivoula intermedia |
| Malayasia Banxring | Pholidota | Southeast Asia | Manis javanica |
| Malea Mouse-eared Bat | Chiroptera | Endemic to the Malea Peninsula in Greece | Myotis maeleae |
| Maleo | Aves | Indonesia | Macrocephalon maleo |
| Mallomys | Rodentia | Montane forests of New Guinea | Mallomys rothschildi |
| Malpelo Island Weasel | Carnivora | Malpelo Island | Mustela malpeloensis |
| Mammoths | Proboscidea | Extinct | Mammuthus sp. |
| Manatee | Sirenia | Coastal waters and rivers in the Americas and West Africa | Trichechus spp. |
| Manchurian Lynx | Carnivora | Eastern Asia | Lynx lynx stroganovi |
| Mandarin Vole | Rodentia | East Asia | Lasiopodomys mandarinus |
| Mandrill | Primates | Central Africa | Mandrillus sphinx |
| Maned Wolf | Carnivora | South America | Chrysocyon brachyurus |
| Mangabey | Primates | Africa | Cercocebus spp. |
| Manidae | Pholidota | Tropical forests of Asia and Africa | Manis |
| Manila Mouse Deer | Artiodactyla | Philippines | Tragulus nigricans |
| Maonan | Primates | Vietnam | Rhinopithecus avunculus |
| Maral | Artiodactyla | Central Asia | Cervus elaphus maral |
| Marbled Cat | Carnivora | Tropical forests of Southeast and East Asia | Pardofelis marmorata |
| Margay | Carnivora | Tropical forests of Central and South America | Leopardus wiedii |
| Markhor | Artiodactyla | Central Asia | Capra falconeri |
| Markhor (Pir Panjal) | Artiodactyla | Kashmir | Capra falconeri cashmiriensis |
| Markhor (Suleman) | Artiodactyla | Pakistan | Capra falconeri jerdoni |
| Marmoset | Primates | South America | Callitrichidae |
| Marmoset Tamarin | Primates | South America | Callithrix |
| Marmot | Rodentia | Mountainous regions of North America and Eurasia | Marmota spp. |
| Marmota | Rodentia | Mountainous regions of North America and Eurasia | Marmota |
| Marquesan Flying Fox | Chiroptera | Marquesas Islands | Pteropus mariannus |
| Marsh Deer | Artiodactyla | South America | Blastocerus dichotomus |
| Marsh Rabbit | Lagomorpha | Southeastern United States | Sylvilagus palustris |
| Marsh Rice Rat | Rodentia | North America | Oryzomys palustris |
| Marshfield Fox | Carnivora | North America | Vulpes fulva marshfieldi |
| Marsupial Mole | Notoryctemorphia | Australia | Notoryctes |
| Martens | Carnivora | Temperate and boreal forests of Eurasia and North America | Martes spp. |
| Martinique Hog-nosed Bat | Chiroptera | Martinique | Anoura geoffroyi |
| Mascarene Flying Fox | Chiroptera | Mascarene Islands | Pteropus subniger |
| Massoutiera | Rodentia | Arid regions of North Africa | Massoutiera mzabi |
| Mastiff Bat | Chiroptera | Latin America and the Caribbean | Molossus molossus |
| Matschie's Tree Kangaroo | Diprotodontia | Montane rainforests of New Guinea | Dendrolagus matschiei |
| Maui Dolphin | Cetacea | Coastal waters around New Zealand | Cephalorhynchus hectori maui |
| Maui Nui Bat | Chiroptera | Hawaii | Lasiurus semotus |
| Mauritanian Gerbil | Rodentia | Mauritania | Gerbillus mauritaniae |
| Mauritian Flying Fox | Chiroptera | Mauritius | Pteropus niger |
| Mauritian Fruit Bat | Chiroptera | Mauritius | Pteropus subniger |
| Mauritian Tomb Bat | Chiroptera | Mauritius | Taphozous mauritianus |
| Mauritius Flying Fox | Chiroptera | Mauritius | Pteropus niger |
| Maxwell's Duiker | Artiodactyla | Tropical forests of West and Central Africa | Philantomba maxwellii |
| Mayotte Flying Fox | Chiroptera | Mayotte | Pteropus mayottensis |
| Mayotte Lemur | Primates | Forests of Mayotte island | Eulemur flavifrons |
| Mayotte Shrew | Eulipotyphla | Mayotte | Sorex mayottensis |
| Mazama Deer | Artiodactyla | Tropical and temperate forests of the Americas | Mazama spp. |
| Meadow Jumping Mouse | Rodentia | Meadows and grasslands of North America | Zapus hudsonius |
| Meadow Vole | Rodentia | North America | Microtus pennsylvanicus |
| Mediterranean House Mouse | Rodentia | Mediterranean region | Mus spretus |
| Mediterranean Monk Seal | Carnivora | Mediterranean Sea | Monachus monachus |
| Meerkat | Carnivora | Deserts and grasslands of southern Africa | Suricata suricatta |
| Merriam's Kangaroo Rat | Rodentia | Deserts of southwestern North America | Dipodomys merriami |
| Mesoplodon | Cetacea | Deep ocean waters worldwide | Mesoplodon |
| Mexican Gray Wolf | Carnivora | Forests and mountains of Mexico and southwestern United States | Canis lupus baileyi |
| Mexican Long-nosed Bat | Chiroptera | Forests and caves of Mexico and southwestern United States | Leptonycteris nivalis |
| Mhorr Gazelle | Artiodactyla | North Africa | Nanger dama mhorr |
| Microbat | Chiroptera | worldwide | various species |
| Microbiotheriidae | Didelphimorphia | Forests of southern South America | Microbiotheriidae |
| Microbiotherium | Didelphimorphia | Forests of southern South America | Microbiotherium tehuelchum |
| Microtus | Rodentia | Grasslands and tundra of the Northern Hemisphere | Microtus |
| Milky Stork | Strigiformes | Southeast Asia | Mycteria cinerea |
| Mimic Poison Frog | Anura | South America | Ranitomeya imitator |
| Mindanao Gymnure | Eulipotyphla | Forests of the Philippines | Podogymnura truei |
| Mindanao Tube-nosed Fruit Bat | Chiroptera | Forests of the Philippines | Nyctimene rabori |
| Mindoro Stripe-faced Fruit Bat | Chiroptera | Philippines | Styloctenium mindorensis |
| Mindoro Striped Shrew | Eulipotyphla | Philippines | Crocidura mindorensis |
| Mindoro Warty Pig | Artiodactyla | Philippines | Sus oliveri |
| Miniature Pinscher | Carnivora | Worldwide | Canis lupus familiaris |
| Miniature Silky Anteater | Pilosa | Forests of Central and South America | Cyclopes ida |
| Miniopterus | Chiroptera | Caves and mines worldwide | Miniopterus |
| Mink | Carnivora | North America and Europe | Neovison spp. |
| Mink Whale | Cetacea | Worldwide in temperate and polar oceans | Balaenoptera acutorostrata |
| Minke Whale | Cetacea | Oceans worldwide | Balaenoptera acutorostrata |
| Missouri Fox Squirrel | Rodentia | North America | Sciurus niger |
| Mithan | Artiodactyla | Forests of Northeast India and Myanmar | Bos frontalis |
| Mohor Gazelle | Artiodactyla | North Africa | Nanger dama mhorr |
| Mole-rat | Rodentia | Africa | Bathyergidae spp. |
| Moluccan Cuscus | Diprotodontia | Indonesia | Phalanger ornatus |
| Moluccan Rat | Rodentia | Indonesia | Bunomys spp. |
| Moluccan Tarsius | Primates | Indonesia | Tarsius splendidulus |
| Mongolian Gazelle | Artiodactyla | Central Asia | Procapra gutturosa |
| Mongolian Marmot | Rodentia | Grasslands of Mongolia | Marmota sibirica |
| Mongoose | Carnivora | Africa and Asia | Herpestes spp. |
| Monito del Monte | Paucituberculata | South America | Dromiciops gliroides |
| Monkey | Primates | Africa and Asia | Cercopithecidae spp. |
| Montane Vole | Rodentia | Western North America | Microtus montanus |
| Moose | Artiodactyla | Boreal and temperate forests of North America and Eurasia | Alces alces |
| Mouflon | Artiodactyla | Mediterranean region | Ovis orientalis |
| Mountain Beaver | Rodentia | Western North America | Aplodontia rufa |
| Mountain Bongo | Artiodactyla | East Africa | Tragelaphus eurycerus isaaci |
| Mountain Cottontail | Lagomorpha | North America | Sylvilagus nuttallii |
| Mountain Goat | Artiodactyla | Western North America | Oreamnos americanus |
| Mountain Gorilla | Primates | Central Africa | Gorilla beringei beringei |
| Mountain Hare | Lagomorpha | Mountainous regions of Eurasia | Lepus timidus |
| Mountain Lion | Carnivora | Varied habitats across the Americas | Puma concolor |
| Mountain Nyala | Artiodactyla | Ethiopia | Tragelaphus buxtoni |
| Mountain Pygmy Possum | Diprotodontia | Australia | Burramys parvus |
| Mountain Tapir | Perissodactyla | Montane forests of Colombia and Ecuador | Tapirus pinchaque |
| Mountain Yellow-legged Frog | Anura | High-elevation lakes and streams of western North America | Rana muscosa |
| Mouse | Rodentia | Worldwide | Mus spp. |
| Mouse Lemur | Primates | Madagascar | Microcebus spp. |
| Mozambique Mouse | Rodentia | Africa | Mus minutoides |
| Muir's Digging Mouse | Rodentia | Grasslands of Australia | Mus murrayi |
| Muriqui | Primates | Southeastern Brazil | Brachyteles |
| Musk Ox | Artiodactyla | Arctic North America and Greenland | Ovibos moschatus |
| Muskrat | Rodentia | North America | Ondatra zibethicus |
| Mustang | Perissodactyla | North America | Equus ferus caballus |
| Myotis | Chiroptera | Worldwide | Myotis spp. |
| Méditerranée Dolphin | Cetacea | Mediterranean Sea | Stenella coeruleoalba |