mammals 4,450 species. characteristics body covered with hair 4 limbs 7 cervical vertebrae 4...
DESCRIPTION
Characteristics Moveable eyelids Fleshy external ears Diphyodont teeth ( 2 sets)TRANSCRIPT
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