Mammals By: Morgan, Hailey, Madison, Madi,Kaite

Key Terms  Mammals- a group of vertebrates.  Mammary Glands- were milk is stored.  Diagram- large mussels.  Monotreme- egg laying mammal.  Marsupial- young who is born in early development.  Gestation Period- the length between fertilization and birth.  Placental mammal- develops insides mothers body.  Placenta- an organ in a pregnant female.

Common characteristics  All animals have fur they are all endothermic vertebrates. Most mammals are born and are fed by organs in the mother, known as mammary glands.

Internal conditions stable  All mammals are endotherms  The energy in there food keep their temperature stable.  There fur allows them to live in cold temperatures.

Reproduction  Mammal reproduce using sexual reproduction organs.  They mate to reproduce.  Gestation period is a period between birth and fertilization.  Some mammals called monotremes lay eggs.  Others called placental mammals develops inside its mothers body.

Circulatory system/oxygen  All mammals have a closed circulatory system.  Closed means inside veins  Open means sloshing around inside the body  Closed system makes blood flow through the veins.  Oxygen gets in the blood by entering the body using lungs then it goes through the circulatory system.

Movement  Most mammals walk on four limbs. Only humans walk on two legs. Aquatic mammals have flippers, fins for swimming rather than legs.  Some mammals can glide by flattening their stomach and stretching out their skin between their legs and feet.

Types of organisms  There are three main types of mammals.  Monotremes are egg laying mammals such as the spiny anteater and the platypus.  Marsupials are born in an immature stages, most have pouches such as the wombat, koala, and the kangaroo.  Placenta's young is born in an advanced stage. There is almost four thousand placental mammals such as the human, elephant, whale, dog, cat, and even the mouse.

Interesting Facts  A cat can run up to 12 miles per hour.  Cheetahs do not roar they purr like cats.  Mammals came to Earth about 200 million years ago.

Work Cited Webs: Animalplanet.com Animaldiversity.com Motls.blogspot.com Books: Life Science E.Guides National Geographic Mammal Book

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