MammalsMammalsChapter 36Chapter 36

Section 1Section 1

Five key Five key characteristicscharacteristics

Some hairSome hair Diverse & specialized Diverse & specialized

teethteeth EndothermicEndothermic Mammary GlandsMammary Glands placentaplacenta

Section 1Section 1

Mammals have Mammals have diverse, specialized diverse, specialized teethteeth

1.1. MolarsMolars

2.2. IncisorsIncisors

3.3. PremolarsPremolars

4.4. caninecanine

Section 1Section 1

Mammary glands are Mammary glands are used for milk used for milk productionproduction

Weaning is done Weaning is done when baby animal when baby animal can feed on their owncan feed on their own

Section 2 Today’s MammalsSection 2 Today’s Mammals

MonotremesMonotremes

1.1. Most primitiveMost primitive

2.2. Order of Order of MonotremataMonotremata

3.3. Three living speciesThree living species

a.a. PlatypusPlatypus

b.b. Two species of Two species of EchidnaEchidna

MarsupialsMarsupials

Include wombats, kangaroos, wallaroos, Include wombats, kangaroos, wallaroos, koalas, and opossumskoalas, and opossums

Are born days or weeks after fertilization Are born days or weeks after fertilization and fully develop in a pouchand fully develop in a pouch

Placental MammalsPlacental Mammals

Placenta - allows diffusion of nutrients and Placenta - allows diffusion of nutrients and oxygen into the fetusoxygen into the fetus

Gestation Period - time when fetus is Gestation Period - time when fetus is developingdeveloping

Today’s PlacentalsToday’s Placentals

RodentiaRodentia 40% of placentals40% of placentals Teeth grow Teeth grow

continually and are continually and are used for gnawingused for gnawing

Mice, rat, squirrelMice, rat, squirrel

ChiropteraChiroptera Bats the only Bats the only

mammal capable of mammal capable of flightflight

InsectivoraInsectivora Eats insectsEats insects Includes the mighty shrewIncludes the mighty shrew

CarnivoraCarnivora Eat mostly meatEat mostly meat Include cats, dogs, Include cats, dogs,

bears, raccoonsbears, raccoons

PinnipediaPinnipedia Marine carnivoresMarine carnivores Have flippers, insulating layer of blubberHave flippers, insulating layer of blubber Include the walrusInclude the walrus

PrimatesPrimates Monkey, humanMonkey, human Most advancedMost advanced

ArtiodactylaArtiodactyla Are called ungulates Are called ungulates

with even # of toeswith even # of toes Have a rumen and Have a rumen and

chew cudchew cud Includes pigs, Includes pigs,

giraffes, sheep, cattlegiraffes, sheep, cattle

PerissocactylaPerissocactyla Ungulates with an Ungulates with an

odd # of toesodd # of toes Include horse, zebras, Include horse, zebras,

rhinorhino

CetaceaCetacea Live in waterLive in water Dolphins, porpoises, Dolphins, porpoises,

whalewhale have a plow hole have a plow hole

used to breathused to breath

LagomorphaLagomorpha Rabbits and hairsRabbits and hairs Teeth grow all the Teeth grow all the

timetime

SireniaSirenia Barrel-shaped bodyBarrel-shaped body Manatees or called the sea cowManatees or called the sea cow

ProboscideaProboscidea Elephants the largest Elephants the largest

on landon land

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