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Mammals. Chapter 36. Section 1. Five key characteristics Some hair Diverse & specialized teeth Endothermic Mammary Glands placenta. Section 1. Mammals have diverse, specialized teeth Molars Incisors Premolars canine. Section 1. Mammary glands are used for milk production

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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 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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  • 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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