Mammals

1
Mammals
Gray Wolf
Chimpanzee
Indo-Chinese Tiger
Beluga Whale
Prairie Dog
2
Basic Characteristics

• Endothermic (pant/sweat/shiver)
• Hair
• Unique to mammals
• Insulation, waterproofing, communication,
  camouflage, protection.
• Nurse young mammary glands
• Modified Limbs for gathering food
• Opposable thumbs to grasp (some)

3
Body systems

• Nervous highly sophisticated intelligence
  sense organs and brain.
• Circulatory four-chambered heart high oxygen
  supply for energy.
• Respiratory lungs with a diaphragm (muscle to
  expand and contract chest)
• Digestive Teeth types help distinguish food
  sources
• Incisors (grasping, holding, chiseling)
• Canines (puncture/tear)
• Molars (grind/crush)

4
Groups of Mammals

• Placental Mammals
• Carries young inside body until development is
  almost complete
• Protects offspring from predators and environment
• Nourishment provided by placenta
• Gestation (time of pregnancy) varies
• Largest sub-class (approx. 95)

5
Group 2 Marsupials

• Pouched Mammals / Marsupials
• Short period of development in the body of
  mother, followed by longer period inside a pouch
  outside the mothers body.
• Majority found in Australia
• Success rate not as high as placental

6
Monotremes

• Egg-laying mammals
• Reproduction takes place through the presence of
  laying eggs
• Only three species are monotremes
• Duck-billed platypus
• Two-types of spiny anteaters
• Found in Australia and New Guinea
• http//www.bol.ucla.edu/amberm/amber.htm

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Heart Comparisons

• http//www.mhhe.com/biosci/genbio/biolink/j_explor
  ations/jhbch05.htm