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