1. Mammals
Hickman
Chapter 28
E-6

2. Mammals 4800 living species Characteristics Hair Placental
Specialized teeth and jaws
Advanced nervous system

3. Integument
Epidermis
Dermis
Thicker
Hypodermis

4. Hair Flexible strand of dead, keratinized cells Functions Main regions
Root
Shaft
Hair bulb
Arrector pili
Types
Underhair
Guard hair

5. Horns and Antlers True horns Antlers Family Bovidae
Hollow sheaths of keratinized epidermis
Not shed, not branched
Continuous growth
Antlers
Family Cervidae
Solid bone
Shed after breeding season

6. Glands Derived from the epidermis Sweat glands Sebaceous glands
Eccrine
Apocrine
Sebaceous glands
Scent glands
Mammary glands

7. Sweat Glands Widely distributed on body Sweat Types Mostly water
Eccrine (merocrine)
Apocrine

8. Sebaceous Glands Occur over entire body Secrete sebum
Associated with hair follicle
Sebum functions

9. Teeth Many vertebrates have toothlike structures
Mammalian teeth unique
Three main parts
Crown
Neck
Root
Three main layers
Enamel
Dentin
Pulp

10. Teeth Four types of teeth Shape of teeth reflects the type of diet
Incisors
Canines
Premolars
Molars
Shape of teeth reflects the type of diet

11. Insectivores
Most small
Insects, small invertebrates
Short intestine

12. Herbivores Two types Cellulose in diet Browsers/ grazers Gnawers
No cellulases
Anaerobic fermentation chambers
Cecum

13. Carnivores Feed on herbivores Protein diet Easily digestible
Short intestine

14. Omnivores Plant and animal tissues Food supplies vary by season
May store food

15. Specimens Bison Coyote Black bear Bobcat Red fox Pronghorn Beaver
Brown bear
American weasel
Mink
Musk rat
White-tailed deer
Ground hog
Wild boar
Red squirrel
Grey squirrel
Jack rabbit
Opossum
Irmine
Eastern cottontail