Mammals

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Mammals

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Section 1

Five key characteristics

Some hair

Diverse & specialized teeth

Endothermic

Mammary Glands

placenta

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Section 1

Mammals have diverse, specialized teeth

Molars

Incisors

Premolars

canine

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Section 1

Mammary glands are used for milk production

Weaning is done when baby animal can feed on their own

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Today’s Mammals

Monotremes

Most primitive

Order of Monotremata

Three living species

Platypus

Two species of Echidna

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Marsupials

Include wombats, kangaroos, wallaroos, koalas, and opossums

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

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Placental Mammals

Placenta - allows diffusion of nutrients and oxygen into the fetus

Gestation Period - time when fetus is developing

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Today’s Placentals

Rodentia

40% of placentals

Teeth grow continually and are used for gnawing

Mice, rat, squirrel

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Chiroptera

Bats the only mammal capable of flight

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Insectivora

Eats insects

Includes the mighty shrew

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Carnivora

Eat mostly meat

Include cats, dogs, bears, raccoons

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Pinnipedia

Marine carnivores

Have flippers, insulating layer of blubber

Include the walrus

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Primates

Monkey, human

Most advanced

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Artiodactyla

Are called ungulates with even # of toes

Have a rumen and chew cud

Includes pigs, giraffes, sheep, cattle

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