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Diversity of Mammals . 5 th Grade . There are 3 main groups of mammals. These groups differ in how their young develop . . 3 main groups of mammals : . 1) Monotremes 2) Marsupials 3) Placental Mammals.

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3 main groups of mammals
3 main groups of mammals:
  • 1) Monotremes
  • 2) Marsupials
  • 3) Placental Mammals
monotremes are still considered mammals because they drink milk from their mother s skin
Monotremes are still considered mammals because they drink milk from their mother’s skin
  • An Anteater lay eggs directly into a pouch in the mother’s belly
  • A Duck-billed platypus lays her eggs in an underground nest
  • Egg-laying mammals

-2 species of anteaters

-Duck-billed platypus

Why are these still considered mammals?

  • Mammals whose young are born at an early stage of development, and they usually continue to develop in a pouch on the mother’s body
  • short gestation period: the length of time between fertilization and birth
examples of marsupials
Examples of Marsupials
  • Kangaroos
  • Wallabies
  • Koalas
  • Wombats
  • Tasmanian Devils
  • Possums
  • Gliders
placental mammals
Placental Mammals
  • Develops inside its mother’s body until it can function independently
  • Name comes from placenta: an organ in pregnant female mammals that passes materials between the mother and the developing embryo
  • Food and oxygen pass from the mother to her young
  • An umbilical cord connects the young to the mother’s placenta.
most mammals are placental mammals
Most mammals are placental mammals
  • The gestation period for animals usually depends on their size
  • Elephants have a 21 month gestation period
  • Mice have a 20 day gestation period
placental mammals carnivores have large canine teeth and clawed toes to catch prey
Placental Mammals – Carnivores: have large canine teeth and clawed toes to catch prey
  • River Otters
  • Dogs
  • Raccoons
  • Seals
Placental Mammals - Rabbits and Hares – Leaping mammals with long hind legs & long, curved incisors for gnawing
placental mammals rodents are gnawing mammals such as mice rats beavers capybaras
Placental Mammals –Rodents –are gnawing mammals such as mice rats, beavers, capybaras
  • Rats
  • Mice
  • Beavers
  • Capybaras



placental mammals trunk nosed m ammals
Placental Mammals – Trunk-nosed mammals
  • Elephants
  • Woolly Mammoth (extinct)
placental mammals flying mammals
Placental Mammals – Flying Mammals
  • Bats –their wings are made of a thin skin that stretches from their wrists to the tips of their long finger bones

Flying Fox Bat

placental mammals primates
Placental Mammals - Primates
  • Have large brains and eyes that face forward
  • Include humans, monkeys, chimpanzees, orangutans, lemurs, etc.
placental mammals primates toothless mammals
Placental Mammals –Primates-Toothless Mammals
  • Have either very small or no teeth
    • Armadillos
    • Sloths
caring for young
Caring for Young
  • Monotremes, Marsupials, and Placental Mammals all care for their young
  • Baby mammals are helpless for a long time after being born –many are born blind or withoutinsulating fur
  • Young mammals stay with their mothers or both parents for an extended period of time