Mammals

1
Mammals

• 17-2

2
Mammal Characteristics

• Mammary Glands
• Secrete milk
• Females supply milk to young
• Most bear live young and care for offspring

3
Mammal Characteristics

• Warm blooded
• (Ectotherms)
• Maintain a stable body temperature
• Require lots of energy from food

4
Mammal Characteristics

• Hair or Fur
• Made of the same protein as scales and feathers

5
Mammal Characteristics

• Specialized teeth
• Tooth shape fits function
• Milk teeth replaced by adult teeth

6
Mammal Characteristics

• Lungs
• Diaphragm
• Muscle that draws oxygen into lungs

7
Mammal Characteristics

• Large brains
• 5 Well developed senses
• Allow mammal to move, learn, and think quickly

8
Reproduction

• Sexual by internal fertilization
• Most give live birth
• All nurse their young
• One or both parents care for young
• 3 types of development
• Monotremes
• Marsupials
• Placental mammals

9
Development

• Monotremes
• Egg laying mammals
• Young are fed with milk after they hatch

10
Development

• Marsupials
• Pouched mammals
• Young are born underdeveloped
• Finish inside a pouch

11
Development

• Placental mammals
• Young develop inside the longest
• Gestation periodthe time the baby spends inside
  mother
• Attached to mom by a placenta
• Organ that transfers nutrients and waste