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Mammals - Pictures and Facts
Mom and Two Daughtersby Mark Dumont on Flickr


  • are vertebrate animals (means they have a backbone or spine)
  • are endothermic or “warm-blooded,” endothermic animals regulate their own body temperate which allows them to live in almost every climate on Earth
  • have possession of hair on their bodies
  • produce milk to feed their babies
  • have sweat glands

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Family Bath Timeby Steve Wilson on Flickr

  • Largest group of mammals, the placentals, have a placenta which feeds the offspring during gestation. 
  • Before birth, the young are nourished through a placenta. 
  • The placenta is a specialized embryonic organ that is attached the mother's uterus and delivers oxygen and nutrients to the young.
There are almost 4,000 known species of placental mammals. Humans, Cats, Dogs, mice and whales are all placental mammals and are all related.

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Bilateral Symmetryby Furryscaly on Flickr

Skeletal system

  • The majority of mammals have seven cervical vertebrae bones in the neck. Example: bats, giraffes, whales, and humans. 
  • The few exceptions include the manatee and the two-toed sloth, which have only six cervical vertebrae, and the three-toed sloth with nine cervical vertebrae.

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Baby Gray Squirrelby audreyjm529 on Flickr

Respiratory system

  • In air-breathing vertebrates, respiration takes place in the respiratory organs called lungs. 
  • The passage of air into the lungs to supply the body with oxygen is known as inhalation, and the passage of air out of the lungs to expel carbon dioxide is known as exhalation; this process is collectively called breathing or ventilation
  • In humans and other mammals, the anatomical features of the respiratory system include include tracheabronchi,bronchioles, lungs, and diaphragm
  • Molecules of oxygen and carbon dioxide are passively exchanged, by diffusion, between the gaseous external environment and the blood
  • This exchange process occurs in the alveoli air sacs in the lungs

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