Bio1108 Ex5 Mammals

Front 1

General traits

Back 1

-Hair
-mammary glands
-Thick skin, thin epidermis
-sweat glands, scent glands
-sebaceous glands: expel sebum to keep skin and hair glossy
-most heterodont (different types of teeth)
-mating season, polygamous
-oviparous, marsupial, or eutherian

Front 2

Hair growth

Back 2

-grows from follicle
-rapid proliferation of cells
-pushed upward, cells die and turn to keratin

Front 3

Hair molting

Back 3

-some hair continuously grows
-some ramains short
-hairs lost when new growth starts
-most molt at least once a year

Front 4

Modified hairs

Back 4

-Whiskers (vibrissae) provide tactile sense to many mammals
-Movement generates sensory nerve impulses that travelt ot special sensory areas of brain
-some can be modified into spines (porcupines, echidnas)

Front 5

Insectivore

Back 5

-eat insects
-small, pointed teeth
-simple digestive system
-small-bodied animals (moles, shrews, bats)

Front 6

Herbivore

Back 6

-eat vegetation
-reduced canines, broad, high crowned molars
-enlarged digestive tracts (cellulose difficult to break down)
-Foregut fermentation (ruminants) and hindgut fermentation
-ex: cattle, elephants, gorillas

Front 7

Carnivores

Back 7

-feed on herbivores
-biting, piercing teeth
-powerful clawed limbs
-short, simple digestive tract
-lions, tigers, dogs, foxes

Front 8

Omnivores

Back 8

-plants and animals
-variable dentition and digestive system
-pigs, raccoons, bears, many primates