Transcript Section 35.2 - Walker Elementary

Section 35.2
Today’s Mammals
Grouped by reproduction

Monotremes

Most primitive mammals

All modern monotremes live in Australia

Egg-laying mammals

Three types:

Duck-billed platypus and two types of
spiny anteaters
Reproduction…

Marsupials

Most live in Australia

Babies finish development in
mother’s pouch

Kangaroos, wombats, koalas,
possums
Reproduction…

Placental mammals

Most advanced mammals

Live all over the world on land and
in oceans

Young develop inside mother’s
uterus, attached to a placenta
Main Placental Mammal
Groups



Rodents – gnawing mammals; 40% of
all placental mammals; rats, mice
Bats – flying mammals with front legs
modified into wings; most eat insects,
some fruit; use sonar for navigation
Insectivores – insect eaters like
shrews; small with very fast
metabolism
Main Placental Mammal
Groups…

Carnivores – meat eating mammals,
include cat family (lion, tiger) and dog
family (wolf, fox); strong and very
intelligent

Pinnipeds – marine mammals with
flippers for swimming that return to land
to reproduce; walrus, seal, sea lions

Primates – forward facing eyes, grasping
hands; apes, monkeys, humans
Main Placental Mammal
Groups…


Ungulates – hoofed mammals, grazing
animals; some with an even number of
toes (deer), others with an odd
number (horse); many chew cud to
continue digesting tough plant
material
Cetaceans – marine mammals that
spend entire life in sea; two groups –
toothed whales (hunters) and baleen
whales (filter feeders)
Main Placental Mammal
Groups…

Lagomorphs – long legs for
jumping; rabbits and hares

Sirenia – barrel-shaped marine
mammals; manatees

Elephants – long nose (proboscis)
two groups – African and Asian