mammals 4,450 species. characteristics body covered with hair 4 limbs 7 cervical vertebrae 4...

MammalsMammals4,450 species4,450 species

CharacteristicsCharacteristics Body covered with hairBody covered with hair

4 limbs4 limbs

7 cervical vertebrae7 cervical vertebrae

4 chambered heart4 chambered heart

CharacteristicsCharacteristicsMoveable eyelidsMoveable eyelids

Fleshy external earsFleshy external ears

Diphyodont teeth ( 2 sets)Diphyodont teeth ( 2 sets)

CharacteristicsCharacteristicsHomeothermicHomeothermic

maintain constant body maintain constant body temperaturetemperature

Dioecious Dioecious sexes separatesexes separate

Brain Brain highly developed with highly developed with

cerebrum (reasoning)cerebrum (reasoning)

GlandsGlands1. Sweat – cooling1. Sweat – cooling

2. Sebaceous – oil gland 2. Sebaceous – oil gland *near hair follicles, *near hair follicles, *makes pelt nice & shiny*makes pelt nice & shiny

3. Scent – marking territory, courtship3. Scent – marking territory, courtship

4. Mammary – nursing young4. Mammary – nursing young

RespirationRespirationLungsLungs

Alveoli (air sacs) Alveoli (air sacs) – – provide much surface provide much surface area for area for gas exchangegas exchange

Larynx (voice box) Larynx (voice box) for making soundsfor making sounds

ExcretionExcretionWell developed kidneysWell developed kidneys

Ureters (tubes to bladder)Ureters (tubes to bladder)

Bladder (holds urine)Bladder (holds urine)

ReproductionReproductionThree different reproductive patterns of Three different reproductive patterns of

MammalsMammals

I. I. Monotremes Monotremes eg. echidna, platypuseg. echidna, platypus

II. II. MarsupialsMarsupials e.g. kangaroo, opossum, wallaby, e.g. kangaroo, opossum, wallaby, wombat, numbat, Tasmanian devilwombat, numbat, Tasmanian devil

III. III. Placental MammalsPlacental Mammals e.g. dog, deer, human e.g. dog, deer, human

I. I. MonotremesMonotremes

Lay eggs (embryo Lay eggs (embryo nourished by nourished by egg yolk)egg yolk)

Incubate eggs in nestIncubate eggs in nest

Nurse youngNurse young

I. I. MonotremesMonotremes

II. II. MarsupialsMarsupials Embryo not nourished by Embryo not nourished by

placental attachmentplacental attachment

Very undeveloped embryo bornVery undeveloped embryo born

Must crawl to pouchMust crawl to pouch

II. II. MarsupialsMarsupials Young finish development in Young finish development in

pouchpouch

Nurse in pouchNurse in pouch

E.g. red kangaroo –E.g. red kangaroo –nurses young 2 yearsnurses young 2 years

II. II. MarsupialsMarsupials

III. III. Placental MammalsPlacental Mammals e.g. dog, deer, humane.g. dog, deer, human

Embryo nourished through Embryo nourished through placentaplacenta

Young born liveYoung born live

Extensive parental careExtensive parental care

Nurse young (prevents next Nurse young (prevents next pregnancy) pregnancy)

Placental MammalsPlacental Mammals