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Introduction to Mammals

Introduction to Mammals. Endotherms Hair or Fur Feed Young with Milk. Phylogeny. Separated into three groups Prototheria (before gestation) – egg laying mammals Metatheria (middle gestation) – pouched mammals Eutheria (true gestation) – live birth from uterus. Milk.

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Introduction to Mammals

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  1. Introduction to Mammals Endotherms Hair or Fur Feed Young with Milk

  2. Phylogeny • Separated into three groups • Prototheria (before gestation) – egg laying mammals • Metatheria (middle gestation) – pouched mammals • Eutheria (true gestation) – live birth from uterus

  3. Milk Produced in mammary glands • May have been sweat glands • Feed young, increase success

  4. Types of teeth • Incisors – cutting • Canines – can be enlarged, piercing • Carnassal – shearing, remove meat from bones • Molars - grinding

  5. Cardiovascular System • Body temperature is internally regulated (endothermic) • Heart is 4-chambered • High metabolism • Heart rate – depends on size of animal (smaller = faster rate)

  6. Excretory System • Urinary bladder – need more water per day • Advanced kidneys – filter more blood

  7. Reproductive System Dioecious Highly variable in shape Placental mammals Nonplacental mammals

  8. Digestive System • Length differs based on diet • Predators short • Herbivores very long • Omnivores medium length

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