1. Mammals

2. POINT > Identify characteristics of mammals
POINT > Describe three subclasses of mammals
POINT > Describe mammalian teeth
POINT > Identify various orders of mammals

3. POINT > Identify characteristics of mammals
Class Mammalia: endothermic vertebrates with fur or hair
Infants are fed with milk produced by mother’s mammary glands
Have highly specialized teeth
Four chambered heart
Includes 4000 species: dominant land animals on earth

4. POINT > Identify characteristics of mammals
Two features distinguish them from other vertebrates:
Fur or hair
Mammary glands

5. POINT > Identify characteristics of mammals
Heart has 4 chambers Diaphragm muscle aids in breathing

6. What are 4 characteristics of mammals?
CHECK:
What are 4 characteristics of mammals?
Which 2 characteristics are only in mammals?
What is the diaphragm?

7. POINT > Describe three subclasses of mammals
1. Monotremes are egg-laying mammals Only 3 types of monotremes: Duck-billed platypus and two species of spiny anteaters Not completely endothermic (body temperature is lower and changes) Limbs modified for swimming or digging Australia and New Guinea

8. POINT > Describe three subclasses of mammals
Duck-billed platypus: the only poisonous mammal
Monotremes
Spiny anteater

9. What is the only poisonous mammal?
CHECK:
What are monotremes?
What is the only poisonous mammal?

10. POINT > Describe three subclasses of mammals
2. Marsupials: infants stay in mother’s pouch for some time after birth
POINT > Describe three subclasses of mammals
Short gestation period (time from fertilization to birth)
Ex. Koalas, kangaroos, opossums

11. POINT > Describe three subclasses of mammals
Marsupials

12. What are 2 examples of marsupials? What is gestation period?
CHECK:
What are marsupials?
What are 2 examples of marsupials?
What is gestation period?

13. POINT > Describe three subclasses of mammals
3. Placental mammals: Babies develop more fully inside mother
The placenta is the organ that supplies food and oxygen to the embryo, and eliminates wastes
The infant is attached to the placenta
by the umbilical cord

14. POINT > Describe three subclasses of mammals
95% of all mammals are placentals Oxygen and nutrients are transferred from mother’s blood to baby’s blood through the placenta

15. POINT > Describe three subclasses of mammals
Gestation period is longer in placental mammals Gestation length is correlated with adult size (bigger mammals have longer gestation periods)

16. What is the umbilical cord?
CHECK:
What is the placenta?
What is the umbilical cord?
Is the gestation period of placental mammals longer or shorter than other mammals?
Which would have longer gestation period, a mouse or a horse?

17. POINT > Describe mammalian teeth
Most mammals have 4 different types of teeth: Incisors, canines, premolars, and molars Different types of teeth reflect different diets

18. POINT > Describe mammalian teeth
Different types of teeth reflect different diets

19. What are 4 types of teeth in mammals?
CHECK:
What are 4 types of teeth in mammals?
Which type of teeth are good for cutting?
Which type of teeth are good for grinding?

20. POINT > Identify various orders of mammals
Order Rodentia: Largest mammalian order (over 2,400 species) Includes squirrels, chipmunks, gophers, mice, rats, and porcupines.

21. POINT > Identify various orders of mammals
Order Chiroptera: over 900 species of bats
Live throughout the world except in polar environments

22. POINT > Identify various orders of mammals
Order Cetacea: 90 species of whales, dolphins, and porpoises are distributed worldwide Cetaceans have fishlike bodies with forelimbs modified as flippers

23. POINT > Identify various orders of mammals
Order Carnivora: 250 living species in distributed worldwide Most of the species mainly eat meat, which explains the name

24. POINT > Identify various orders of mammals
Order Primates: 200 living species Including lemurs, monkeys, and great apes (including humans)

25. What are 2 types of rodents? What are 2 types of cetaceans?
CHECK:
What are 2 types of rodents?
What are 2 types of cetaceans?
What are 2 types of carnivores?
What are 2 types of primates?

26. Homework:
Read
Complete S.A. page 428
GRAS