M. giganteus

M. giganteus may refer to:

• Machairodus giganteus, a large saber-toothed cat species found in Europe, Asia, Africa and North America during the Miocene and Pleistocene
• Macronectes giganteus, the southern giant petrel, a large seabird species of the southern oceans
• Macropus giganteus, the eastern grey kangaroo, a marsupial species found in Australia
• Mastigoproctus giganteus, the giant vinegarroon, a whip scorpion species found in the southern United States
• Mastodonsaurus giganteus, an extinct amphibian species from the Triassic
• Megadytes giganteus, a large diving beetle species found in the Caribbean and in South America
• Megaloceros giganteus, the Irish elk or giant deer, an extinct mammal species found across Eurasia during the Late Pleistocene
• Menodus giganteus, an extinct brontothere species
• Meripilus giganteus, a mushroom species
• Miscanthus giganteus, a large perennial grass hybrid of Miscanthus sinensis and Miscanthus sacchariflorus native to Japan
• Mosasaurus giganteus, an extinct carnivorous aquatic lizard species that lived during the Cretaceous