Also see:
- ..Macaws(6)
- ..Magnoliopsida(61)
- ..Mammals(244)
- ..Manatees(2)
- ..Mandrills(1)
- ..Mantids(2)
- ..Marsupials(14)
- ..Mayflies(1)
- ..Minke Whale(1)
- ..Mites(2)
- ..Molluscs(23)
- ..Mongoose(2)
- ..Monitor Lizards(1)
- ..Monocots(34)
- ..Monotremes(1)
- ..Moose(3)
- ..Mosquitoes(4)
- ..Moths(15)
- ..Mountain Lions(4)
- ..Muridae(2)
- ..Mushrooms(1)
- ..Mustelids(14)