Mammals Chapter 36

Section 1  Five key characteristics  Some hair  Diverse & specialized teeth  Endothermic  Mammary Glands  placenta

Section 1  Mammals have diverse, specialized teeth 1. Molars 2. Incisors 3. Premolars 4. canine

Section 1  Mammary glands are used for milk production  Weaning is done when baby animal can feed on their own

Section 2 Today’s Mammals  Monotremes 1. Most primitive 2. Order of Monotremata 3. Three living species a. Platypus b. Two species of Echidna

Marsupials  Include wombats, kangaroos, wallaroos, koalas, and opossums  Are born days or weeks after fertilization and fully develop in a pouch

Placental Mammals  Placenta - allows diffusion of nutrients and oxygen into the fetus  Gestation Period - time when fetus is developing

Today’s Placentals  Rodentia  40% of placentals  Teeth grow continually and are used for gnawing  Mice, rat, squirrel

 Chiroptera  Bats the only mammal capable of flight

 Insectivora  Eats insects  Includes the mighty shrew

 Carnivora  Eat mostly meat  Include cats, dogs, bears, raccoons

 Pinnipedia  Marine carnivores  Have flippers, insulating layer of blubber  Include the walrus

 Primates  Monkey, human  Most advanced

 Artiodactyla  Are called ungulates with even # of toes  Have a rumen and chew cud  Includes pigs, giraffes, sheep, cattle

 Perissocactyla  Ungulates with an odd # of toes  Include horse, zebras, rhino

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

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

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

 Proboscidea  Elephants the largest on land

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