1. Mammals
Kingdom Animalia ---Phylum Chordata Subphylum Vertebrata Class Mammalia

2. Characteristics 1. Hair (some marine mammals have very little)
2. Specialized Teeth
3. Endothermic (warm-blooded)
4. Mammary Glands
5. Placenta (most)
6. Diaphragm - muscle that aids breathing

3. Evolution of Mammals
Mammals did not come to dominate until the CENOZOIC ERA, after the dinosaurs became extinct
Early mammals were probably rodent-like and nocturnal

5. How do mammals stay warm?
Hair insulates most mammals
Some marine mammals have a layer of subcutaneous fat (blubber)

6. What is the placenta?
Attached to the wall of the uterus , it provides the fetus with nourishment. 

7. The Birth of a Giraffe

8. What are mammary glands?
Only found in mammals, produce milk to feed young.

9. How the Diaphragm Works

10. Specialized Teeth Incisors – biting Canines - stabbing, holding
molars - crushing, grinding
Different types of mammals have different types of teeth - depending on their diet.
Predators have large canines Herbivores have large flat molars

11. The canines of predators are very large and sharp, used for tearing flesh.

12. Digestion Mammals have diverse diets.
Herbivores often have an extra stomach chamber called a RUMEN to help them digest plants.
This chamber holds bacteria that can digest plant material.

13. Circulation
Mammals have a 4 – chambered heart and double loop circulation.

14. Movement Mammals are a diverse group. Some… Run Climb Dig Fly Swim
Legs are adapted to a particular job.

15. Reproduction
Most mammals give birth to live young. There are two groups that are exceptions…
Monotremes (lay eggs)
Marsupials (develop young in a pouch)

16. Order Monotremata Egg laying mammals found only in Australia
Have reptilian characteristics (cloaca & egg laying)
Have mammalian features (hair, mammary gland)

17. Examples: Duck Billed Platypus and the Echidna (also called a Spiny Anteater)

19. Order Marsupiala
Mammals bear their young in an immature state, babies develop in a pouch
Majority are found on Australia, opossums are found on other continents

20. Marsupial Examples
Can you name these animals?

21. Kangaroo Birth

22. Placental Mammals
Placental Mammals have a gestation period (length of time in uterus)
Domesticated animals have been kept and bred by people - cows, dogs, pigs, horses..etc