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Class Mammalia

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Class Mammalia

  1. 1. Class Mammalia
  2. 2. Characteristics •Mammary glands •Hair •Diaphragm •Three middle ear ossicles
  3. 3. Characteristics •Heterodont dentition •Sweat, sebaceous, scent glands •Four chambered heart •Large cerebral cortext
  4. 4. Mammary Glands
  5. 5. Hair •Regulate body temperature •Protection
  6. 6. Ossicles
  7. 7. Dentition
  8. 8. Heterodont Dentition
  9. 9. Human teeth
  10. 10. Large Cerebral Cortex
  11. 11. Types of Mammals •Monotremes •Marsupials •Placental
  12. 12. Monotremes Duck-billed Platypus Echidna (Spiny Anteater)
  13. 13. Marsupials • Pouched • Not mammals well develop young
  14. 14. Placental Mammals • Gives birth to young that remain inside the mother’s body until their body system are able to function independently.
  15. 15. Gestation Period • The time the young spend inside the mother’s uterus.
  16. 16. Animal Camel Cat Cow Chimpanzee Dog Dolphin Elephant, African Ferret Fox Giraffe Goat Guinea pig Hamster Hedgehog Horse Human Gestation Period (days) 406 62 280 237 62 276 640 42 52 395-425 151 68 16 35-40 337 266 Animal Hyena Kangaroo Lion Mink Monkey, rhesus Mouse Opposum Orangutan Pig Rabbit Rat Reindeer Seal, northern fur Sheep Skunk Squirrel, grey Gestation Period (days) 110 40 108 50 164 21 13 245-275 113 32 21 215-245 350 148 62 44
  17. 17. Decrease of Metabolic Rates • Torpor-time of decreased metabolism and lowered body temperature that occurs daily in bats, humming birds and some other small birds and mammals. • Hibernation-decrease metabolism and lowered body temperature that may last for weeks or months. • Winter Sleep-occurs in some large mammals. Sustain mammals through periods of winter inactivity no dropping of temp. substancially. • Aestivation-period of inactivity in some animals that must withstand extended periods of drying. Common in invertebrates, reptiles, and amphibians.

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