1. Mammals

2. Classification Kingdom: Animalia Phylum: Chordata Subphylum:
Vertebrates
Class:
Mammalia
Very diverse class
Live on every continent & in every ocean
3 subclasses:
Monotremes
Marsupials
Placental mammals
19 different orders
4400 Species

3. Key Mammalian Characteristics
1. Endothermic:
Warm-blooded
Can live in any climate
Regulate internal temperature
VERY ACTIVE
Able to perform strenuous activities for long periods of time.
High metabolisms
Require a lot of food

4. Use hair/fur and a layer of subcutaneous fat to conserve heat/ prevent heat lose.

5. Uses sweat glands, panting, or shedding to cool down their bodies.
Recipe for sweat:
Excess heat, water and salt.

6. 2. Hair/Fur Lanugo Marine mammals have a small amount of hair.
Insulation
Camouflage
Protection
Waterproofing
Marine mammals have a small amount of hair.
Lanugo

7. Some animals use it to attract mates:

8. 3. Completely divided 4 chambered heart.
Has a complete septum
Very efficient heart b/c clean & dirty blood never mix

9. Milk production - presence of mammary glands
- which are modified sweat glands
used by the female to feed young
Known as teats
(provide milk from mammary glands)

10. Milk production Milk contains: Protein Sugars Vitamins Fat
Calcium (sm. amt.)
Water

11. 5.Single Jawbone
-the lower jawbone in a mammal is single bone whereas in other vertebrates the lower jaw is made up of 2 or more bones.

12. 6. Specialized Teeth
Teeth in mammals are modified for different functions
Back teeth in general are for: chewing, grinding, crushing, slicing
Molars: grind, crush, or cut food
Pre-molars: shear, shred or grind food

13. Teeth are the 1st place physical digestion occurs.
Front Teeth: in general are used for biting, cutting, seizing prey
Canines: grip & puncture prey
Incisors: used to cut
Teeth are the 1st place physical digestion occurs.

14. Teeth and Skull
Did you know that bone is 5X stronger than steel?

15. Using teeth to identify:
The number, type and size of the teeth vary according to the specific type of mammal and what it eats.

16. History of Mammals
-Mammals first appeared on Earth at the same time as dinosaurs.
-Dinosaurs and mammals competed for food
-Dinosaurs were larger and thus more successful at finding food so dinosaurs were much larger in size.

17. -mammals where only the size
of a small rodents.
-once dinosaurs went extinct the mammals flourished and grew larger in size and are now the most prominent organisms on Earth.

18. Three main groups of Mammals
Monotremes
Marsupials
Placentals
Which are we????????????????

19. Monotremes Oviparity Live in New Guinea and Australia Examples:
Egg layers
lay 1-2 leathery eggs per year
feeds off yolk of egg
mammary glands
Live in New Guinea and Australia
Examples:
Duckbill platypus
Spiny anteater

20. Marsupials 280 species of marsupials/pouched mammals Viviparity
Ex. Opossum (live in US), kangaroo, koala
Viviparity
Give birth to live young
Develop in uterus(sm period of time)
Under-developed young crawl out of vagina into pouch where they feed off teats

22. Placental 19 orders of placental animals Viviparity
Give birth to live young-uterus, placenta, umbilical cord (provides nourishment to fetus from mother)
Gestation period (time it takes for full fetal development) varies with different placentals.
Cared for by parents
Fed w/ mammary glands until old enough to feed on own

23. Gestation Periods
40 weeks
92 weeks
15 weeks
4 weeks
71 weeks
36 weeks