Class Mammalia

5 Characteristics of all Mammals Hair Mammary Glands Sweat Endothermic Diaphragm

Three Classes Monotremes Marsupials Placental

Monotremes Egg laying – leathery eggs “furred reptiles” Babies lick milk from mother’s fur Echidnas and duck billed platypus

Marsupials Pouched Inside pouches are mammary glands Infants are born not fully developed and move to pouch to finish development Different age babies can live in pouch at the same time Live mostly in Australia, New Guinea, and South America Kangaroos, opossums, koalas, Tasmanian devils, wallabies

Placental Most mammals are placental Embryos stay inside mother until fully developed Placenta are special attachments from embryo to uterus Placenta supplies food and oxygen Placenta also removes waste Gestation period is the time it takes for an embryo to develop Gestation ranges from a few weeks to almost 2 years depending on the species

Toothless Mammals Only anteaters are completely toothless. The rest have small teeth Catch insects with long, sticky tongues Anteaters, aardvarks, armadillos, sloth

Insect Eating Also called insectivores Live everywhere except Australia and Antarctica Have very small brains Few specialized teeth thin long pointed nose

Rodents More than 1/3 of all mammals are rodents Found everywhere except Antarctica Most are small Have long, sensitive whiskers All rodents have sharp front teeth for gnawing

Lagomorphs (rabbits) Rodent like Have sharp gnawing teeth Have two sets of incisors in their upper jaws Have short tails Sensitive noses, large ears, and eyes to detect predators

Flying Mammals