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
Carnivora Eat mostly meat Include cats, dogs,
bears, raccoons
Pinnipedia Marine carnivores Have flippers, insulating layer of blubber Include the walrus
on land
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Primates Monkey, human Most advanced
Artiodactyla Are called ungulates
with even # of toes Have a rumen and chew cud Includes pigs, giraffes, sheep, cattle
diverse, specialized teeth Molars Incisors Premolars canine
Section 1
Mammary glands are
used for milk production Weaning is done when baby animal can feed on their own
Mammals
Chapter 36
Section 1
Five key
characteristics Some hair Diverse & specialized teeth Endothermic Mammary Glands placenta
Section 1
Mammals have 1. 2. 3. 4.
Include wombats, kangaroos, wallaroos,
koalas, and opossums Are born days or weeks after fertilization and fully develop in a pouch
Placental Mammals
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

continually and are used for gnawing Mice, rat, squirrel
Chiroptera Bats the only
mammal capable of flight
Insectivora Eats insects Includes the mighty shrew
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