Grzimek Mammals
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- Mexican mouse opossum
Marmosa mexicana
- Mexican mouse opossum
- gray slender mouse opossum
Marmosops incanus
- gray slender mouse opossum
- alpine marmot
Marmota marmota
- alpine marmot
- woodchuck
Marmota monax
- woodchuck
- Vancouver marmot
Marmota vancouverensis
- Vancouver marmot
- American marten
Martes americana
- American marten
- Mzab gundi
Massoutiera mzabi
- Mzab gundi
- Woermann's bat
Megaloglossus woermanni
- Woermann's bat
- Eurasian badger
Meles meles
- Eurasian badger
- striped skunk
Mephitis mephitis
- striped skunk
- Sundevall's jird
Meriones crassus
- Sundevall's jird
- Daurian hedgehog
Mesechinus dauuricus
- Daurian hedgehog
- golden hamster
Mesocricetus auratus
- golden hamster
- Blainville's beaked whale
Mesoplodon densirostris
- Blainville's beaked whale