macaque
macaw
mackerel
maggot
mako shark
mallard duck
mammal
mammoth
manatee

mandrill
man-o'-war
manta ray
mantid
marine mammals
marmoset
marmot
marsupial

mastodon
meadowlark
mealworm
meerkat
merganser
midge
mink
mice

mockingbird
mole
mollusk
monarch butterfly
mongoose
monkey
moose
moray eel

morpho butterfly
mosquito
moth
mouse
mudpuppy
musk ox
muskrat
mussels
mustelids