MacGillivray’s Warbler – Shy North American songbird with a gray hood and sweet trill..
Machaeroides – Saber-toothed prehistoric mammal predator.
Mackenzie Valley Wolf – Largest wolf subspecies, powerful hunter of North America.
Macaque – Intelligent Old World monkey often found near humans.
Macaroni Penguin – Crested penguin with bright orange eyebrows and playful antics.
Macaw – Large, colorful parrot known for intelligence and strong beak.
Macrauchenia – Extinct South American mammal with camel-like body and trunk.
Madagascar Hissing Cockroach – Large, wingless roach that hisses to communicate.
Madagascar Jacana – Long-toed bird that walks across floating plants.
Madagascar Tree Boa – Non-venomous constrictor with rich brown scales.
Madora Moth – African moth whose caterpillars are eaten as a delicacy.
Magellanic Penguin – South American penguin that nests in burrows.
Maggot – Fly larva that feeds on decaying matter.
Magnolia Warbler – Tiny yellow warbler with bold black stripes.
Magpie – Intelligent black-and-white bird known for mimicry and curiosity.
Magyarosaurus – Small, dwarf sauropod dinosaur from ancient Europe.
Mahi Mahi (Dolphin Fish) – Bright tropical fish prized for its speed and flavor.
Maiasaura – “Good mother lizard,” dinosaur known for nurturing her young.
Maine Coon – Gentle giant cat with tufted ears and thick fur.
Malayan Krait – Highly venomous black-and-white banded snake.
Malayan Tiger – Critically endangered tiger subspecies from Malaysia.
Malchi – Maltese–Chihuahua mix, small and affectionate.
Mallard – Familiar wild duck with a green-headed male.
Malteagle – Cheerful Maltese–Beagle cross.
Mal Shi – Loving Maltese–Shih Tzu mix with soft coat.
Malayan Civet – Nocturnal omnivore with striped back and musky scent.
Maltese – Elegant toy dog with long, silky white fur.
Maltese Mix – Small mixed-breed dog with Maltese charm.
Maltese Shih Tzu – Crossbreed known for being gentle and hypoallergenic.
Maltipom – Fluffy hybrid of Maltese and Pomeranian.
Maltipoo – Popular Maltese–Poodle mix, friendly and intelligent.
Mamba – Fast, highly venomous African snake.
Mamushi Snake – Venomous pit viper native to East Asia.
Man of War Jellyfish – Floating colony with long, painful stinging tentacles.
Manatee – Slow-moving sea cow that grazes on seagrass.
Manchester Terrier – Sleek, alert British dog once bred for ratting.
Mandarin Rat Snake – Striking yellow-and-black patterned Asian snake.
Mandrill – Colorful primate with a blue and red face.
Maned Wolf – Long-legged South American canid with foxlike features.
Mangrove Snake – Arboreal snake that lives among coastal mangroves.
Mangrove Snapper – Popular game fish found in warm coastal waters.
Manta Ray – Graceful giant ray that glides through tropical seas.
Mantella Frog – Tiny, brightly colored poison frog from Madagascar.
Marabou Stork – Huge African bird with bald head and scavenging habits.
Marans Chicken – French chicken breed known for dark brown eggs.
Marble Fox – Color morph of the red fox with marbled fur.
Maremma Sheepdog – Italian livestock guardian dog, calm and protective.
Margay – Small spotted jungle cat that can climb down trees headfirst.
Marine Iguana – Sea-swimming lizard that feeds on algae in the Galápagos.
Marine Toad – Large toad also called the cane toad, known for toxic skin.
Markhor – Wild goat with twisted horns found in Asian mountains.
Marmoset – Tiny monkey with expressive face and soft fur.
Marmot – Plump burrowing rodent that hibernates through winter.
Marsh Frog – Europe’s largest frog, often croaking near ponds.
Marsican Brown Bear – Rare Italian subspecies of brown bear.
Masiakasaurus – Small dinosaur with forward-pointing teeth.
Masked Angelfish – Rare deep-water angelfish with striking white body.
Masked Palm Civet – Tree-dwelling civet with distinctive facial mask.
Mason Bee – Solitary bee that uses mud to seal its nest chambers.
Massasauga – Small rattlesnake native to North American wetlands.
Mastador – Large Labrador–Mastiff mix with gentle temperament.
Mastiff – Giant, calm dog breed known for strength and loyalty.
Mastiff Mix – Crossbreed combining Mastiff size with other traits.
Mauzer – Energetic Maltese–Schnauzer hybrid.
May Beetle – Common night-flying beetle also called June bug.
Mayan Cichlid – Colorful, aggressive freshwater fish from Central America.
Meagle – Beagle–Miniature Pinscher mix, lively and alert.
Mealworm Beetle – Beetle whose larvae are farmed as pet and bird food.
Mealybug – Sap-sucking insect pest covered with white wax.
Meerkat – Social, upright-standing mongoose of the African desert.
Megalania – Giant prehistoric monitor lizard from Australia.
Megalochelys – Extinct giant tortoise with enormous shell.
Megalodon – Massive extinct shark, one of the largest predators ever.
Megamouth Shark – Rare deep-sea shark with a huge, filter-feeding mouth.
Meganeura – Giant dragonfly-like insect from the Carboniferous era.
Megatherium – Enormous extinct ground sloth from South America.
Meiolania – Prehistoric horned turtle with a clubbed tail.
Mekong Giant Catfish – Huge freshwater fish native to the Mekong River.
Merganser – Diving duck with slender bill for catching fish.
Mexican Black Kingsnake – Shiny black, nonvenomous snake that eats other snakes.
Mexican Eagle (Northern Crested Caracara) – Bold bird of prey often seen on carrion.
Mexican Fireleg Tarantula – Bright orange-legged tarantula with calm nature.
Mexican Alligator Lizard – Brilliant green lizard that lives in high forests.
Mexican Free-Tailed Bat – Fast-flying bat known for massive cave colonies.
Mexican Mole Lizard – Legless, burrowing reptile with small forelimbs.
Microraptor – Four-winged dinosaur capable of gliding between trees.
Midget Faded Rattlesnake – Small, pale subspecies of the western rattlesnake.
Miki – Tiny companion dog bred for friendliness and travel.
Milk Snake – Colorful, harmless snake that mimics venomous coral snakes.
Milkfish – Silvery tropical fish raised in aquaculture.
Milkweed Aphids – Bright orange pests feeding on milkweed plants.
Millipede – Many-legged decomposer that curls into a spiral when threatened.
Mini Lop – Small, round rabbit with floppy ears.
Miniature Bull Terrier – Compact, muscular version of the Bull Terrier.
Mini Labradoodle – Small Poodle–Labrador cross, affectionate and smart.
Miniature Husky – Scaled-down Husky with the same striking looks.
Miniature Pinscher – Spirited toy dog nicknamed the “King of Toys.”
Mink – Sleek, semi-aquatic carnivore prized for its fur.
Minke Whale – Smallest baleen whale, fast and curious.
Mississippi Kite – Graceful gray bird of prey that eats flying insects.
Moccasin Snake – Another name for the cottonmouth, a venomous water snake.
Mockingbird – Gray songbird famed for mimicking other birds.
Modern Game Chicken – Tall ornamental chicken bred for show.
Mojarra – Shiny tropical fish common in shallow coastal waters.
Mojave Ball Python – Popular pet python morph with tan and gold patterns.
Mojave Rattlesnake – Venomous desert rattlesnake with potent neurotoxin.
Mola mola (Ocean Sunfish) – Giant, flat ocean fish basking near the surface.
Mole – Burrowing mammal with velvety fur and shovel-like paws.
Mole Crab (Sand Flea) – Small crustacean that burrows in beach sand.
Mole Cricket – Insect with spade-like forelegs for digging in soil.
Mole Snake – Large African constrictor that hunts underground.
Mollusk – Diverse group including snails, clams, and squids.
Molly – Hardy livebearing aquarium fish with varied colors.
Monarch Butterfly – Migratory orange-and-black butterfly famed for long journeys.
Mongoose – Quick, snake-fighting mammal of Africa and Asia.
Mongrel – Mixed-breed dog of diverse ancestry.
Monitor Lizard – Large, intelligent reptile often found near water.
Monkey – Intelligent primate known for dexterity and social behavior.
Monkfish – Ugly but tasty bottom-dwelling fish with wide mouth.
Monocled Cobra – Venomous Asian snake with circular hood marking.
Monte Iberia Eleuth – Tiny Cuban frog, among the world’s smallest vertebrates.
Moon Jellyfish – Translucent jelly with four glowing rings.
Moonglow Boa – Albino boa morph with pale pink and white coloring.
Moorhen – Marsh bird with red bill and green legs.
Moose – Tallest deer, with broad antlers and love of wetlands.
Moray Eel – Long, snake-like reef fish with sharp teeth.
Morkie – Lively Maltese–Yorkshire Terrier mix.
Morpho Butterfly – Iridescent blue butterfly from tropical rainforests.
Mosasaurus – Enormous marine reptile apex predator of ancient seas.
Moscow Watchdog – Giant, loyal Russian breed for guarding property.
Mosquito – Small flying insect that feeds on blood.
Moth – Nocturnal insect drawn to light, related to butterflies.
Mountain Bluebird – Sky-blue songbird of western North America.
Mountain Cur – Hardy American hunting and treeing dog.
Mountain Feist – Small, energetic squirrel-hunting dog.
Mountain Gorilla – Endangered, gentle giant ape from Central Africa.
Mountain Beaver – Primitive burrowing rodent, not a true beaver.
Mountain Lion – Solitary North American big cat, also called cougar.
Mourning Dove – Gentle cooing dove common across the Americas.
Mourning Gecko – Self-cloning gecko species found on tropical islands.
Mourning Warbler – Secretive forest songbird with gray hood.
Mouse – Small rodent known for quickness and adaptability.
Mouse Spider – Venomous Australian spider with powerful fangs.
Mouse-Deer (Chevrotain) – Tiny hoofed mammal resembling a miniature deer.
Mozambique Spitting Cobra – Venomous African cobra that spits toxin at threats.
Mud Snake – Glossy black snake that feeds on amphibians.
Mudi – Energetic Hungarian herding dog with curly coat.
Mudpuppy – Aquatic salamander with feathery red gills.
Mudskipper – Amphibious fish that walks and breathes on land.
Mule – Hybrid of horse and donkey, strong and sure-footed.
Mule Deer – Deer with large, mule-like ears found in western North America.
Mulga Snake – Highly venomous Australian brown snake.
Mullet Fish – Coastal fish known for leaping out of the water.
Muntjac – Barking deer with small antlers and tusk-like teeth.
Muscovy Duck – Large, quiet duck with red facial caruncles.
Musk Deer – Hornless deer producing valuable musk scent.
Muskellunge (Muskie) – Large, predatory freshwater fish of North America.
Muskox – Shaggy Arctic grazer with thick coat and curved horns.
Muskrat – Semi-aquatic rodent that builds dome-shaped lodges.
Muttaburrasaurus – Australian herbivorous dinosaur with inflated snout.
Myna Bird – Talking bird famous for mimicking human speech.
Mussurana Snake – Mild-mannered South American snake that eats other snakes.