MAMMALS

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Prepared by: Estrosos , Florelyn J. mammals

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-Some hair -Diverse & specialized teeth -Endothermic -Mammary Glands - placenta FIVE KEY CHARACTERISTICS

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Molars Incisors Premolars canine Mammals have diverse, specialized teeth

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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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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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Insectivora Eats insects Includes the mighty shrew

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Primates Monkey, human Most advanced

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

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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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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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