Ch. 4 Sec. 3 YouTube video-Bill Nye Mammals song
May 14, 2015
Ch. 4 Sec. 3
YouTube video-Bill Nye Mammals song
Characteristics of mammals
Characteristics of mammals
vertebrates
Characteristics of mammals
4-chambered heart
Characteristics of mammals
skin covered with fur or hair
adaptations that keepadaptations that keep mammals warm mammals warm
fat (blubber)
fur
hair
`
Characteristics of mammals
different shaped teeth
4 typesof teeth
incisors caninespremolars
&molars
cut into
food stab &
teargrind & shred
Diet: Herbivores, Carnivores, and Their Teeth video clip
mammal reproductionmammal reproduction
Most young develop in mother’s bodyYoung fed w/ milk made in mother’s mammary glands
Mammal Mothers
Introduction to Mammals video clip
Characteristics of Characteristics of MammalsMammals
endothermic
vertebrate
• thru. lungs
• breathe in & out b/c of rib muscles &
diaphragm=
large muscle located @ bottom of chest
How mammals breatheHow mammals breathe
3 groups of
mammals
monotremes marsupialsplacental mammals
classified into groups based
on how young develop
1. MONOTREMES1. MONOTREMES
• lay eggs
• 3 kinds:
–duck-billed platypus
–2 species of echidna ("spiny anteaters“)
DUCK - BILLED PLATYPUS
newborn platypuses nursing from their
mother
platypus egg
Video clip-Duck Billed Platypus
ECHIDNA (spiny anteater)
Their tongue is very long and sticky and is perfect for catching the hundreds of termites and ants that make up their staple diet.
Echidna eggs
ECHIDNA (spiny anteater)
This monotreme’s tongue is very long and sticky and is
perfect for catching the hundreds of
termites and ants that make up their
staple diet.
Both the duck-billed platypus and the spiny anteater are native to Australia.
BrainPOP-Monotremes
2. MARSUPIALS2. MARSUPIALS
give live birth but @ an early stage of development
• develop in pouch• short gestation
period
The only marsupial from North America:
“Playing possum”
Female opossums may give birth to 21 young at a time.
This opossum is not pregnant. She is carrying 9 infants in her pouch.
Opossums can grasp branches with their long tails.
Marsupials develop in
their mother’s pouch.
A female kangaroo gives birth to only one baby, called a joey, at a time.
One Week
Jelly bean size
8 Weeks
Man's little finger size
Ten Weeks Palm size
6 Months 800 grams
KOALA LIFE
CYCLE
3. PLACENTAL MAMMALS3. PLACENTAL MAMMALS• develop inside mother’s body until body
systems can function independently
• classified into groups based on how:1. they eat2. their bodies move
• examples:1. humans2. bats 3. cows
placentaplacenta
• organ in pregnant female mammals that passes materials between mother & embryo
umbilical cord
gestation period• length of time between fertilization & birth
• the larger the animal the longer the gestation
periodThe gestation period of the largest land animal, the African elephant, averages about 21 months.
A house mouse gives birth after a gestation period of only about 20 days!
Mammal Gestation Period
Placental Placental mammalsmammals
Insect-eaters
Toothless mammals
Mammals with trunks
Star-nosed moleHooved mammals
(rodents)
rodents
Bats are the only mammals truly able to fly.
Bats are the only mammals that can fly.
primates
• large brains
• opposable thumbs- thumb can touch other 4 fingers
It’s question time !!!
What have you learned?
Characteristics of Characteristics of MammalsMammals
endothermic
vertebrate
large muscle located at bottom of chest that helps a mammal breathe
diaphragm
1. MONOTREMES1. MONOTREMES
• lay eggs
• 3 kinds:
–duck-billed platypus
–2 species of echidna ("spiny anteaters“)
3 adaptations that keep3 adaptations that keep mammals warm mammals warm
fat (blubber)
fur
hair
4 typesof teeth
incisors caninespremolars
&molars
cut into
food stab &
teargrind & shred
mammal reproductionmammal reproduction
Internal fertilizationInternal fertilization
Most young develop in mother’s bodyMost young develop in mother’s body
Young fed with milk produced in Young fed with milk produced in mother’s mammary glandsmother’s mammary glands
gestation period• length of time between fertilization & birth
• the larger the animal the longer the gestation period
The gestation period of the largest land animal, the African elephant, averages about 21 months.
A house mouse gives birth after a gestation period of only about 20 days!
primates
• large brains
• opposable thumbs- thumb can touch other 4 fingers
(rodents)
2. MARSUPIALS2. MARSUPIALS
give live birth but @ an early stage of development
• develop in pouch• short gestation
period