Mammals

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Mammals

• Chapter 36

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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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Section 2 Todays 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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Todays 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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• Perissocactyla
• Ungulates with an odd of toes
• Include horse, zebras, rhino

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• Cetacea
• Live in water
• Dolphins, porpoises, whale
• have a plow hole used to breath

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• Lagomorpha
• Rabbits and hairs
• Teeth grow all the time

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• Sirenia
• Barrel-shaped body
• Manatees or called the sea cow

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• Proboscidea
• Elephants the largest on land

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